BOUDIN, Circuit Judge.

Robert Randazzo was president and majority shareholder of New England Shrimp Company ("the Company"), a Massachusetts corporation that imported, processed, and distributed shrimp. In February 1994, a federal grand jury returned a 101-count indictment, charging Randazzo — and in most counts the Company as well — with an array of offenses. The offenses fell into two different categories: 97 "shrimp" charges and four "tax" charges.

The shrimp charges, counts 1 through 97, alleged that Randazzo and the Company used certain substances in producing shrimp that were prohibited or at least needed to be disclosed on labels. The substances increased profits by altering the weight or color of the shrimp, which was sold to the Department of Defense and various commercial purchasers. These allegations underpinned four charges of conspiracy, 18 U.S.C. § 371, and 93 substantive counts of making false statements to and claims against the United States, 18 U.S.C. § 287, and introducing misbranded or adulterated food into interstate commerce, 21 U.S.C. § 331(a), (k) and 333(a)(2).

The tax charges, counts 98 through 101, were brought against Randazzo alone and alleged that he had caused the Company to file false corporate tax returns. 26 U.S.C. § 7206(1). Specifically, the government claimed Randazzo misreported as sales expenses cash sums that he was taking weekly from the Company for personal use and that the Company returns listed as corporate expenses the wages of a person who worked exclusively for the Randazzo family on personal matters.

After a 10-day jury trial in October 1994, Randazzo was convicted on all counts. He was sentenced to 36 months in prison, reflecting a significant downward departure from the Sentencing Guidelines range. He now appeals from his conviction but not his sentence, contending that the trial court erred as to joinder, alleged multiplicity of charges, and instructions. The pertinent facts are set forth as necessary in discussing the separate claims of error.

I. JOINDER OF COUNTS

Randazzo claims that joining the 97 shrimp counts with the four tax counts was improper. Fed.R.Crim.P. 8(a) permits joinder of counts against a single defendant only if the offenses "are of the same or similar character," or "are based on the same act or transaction or on two or more acts or transactions connected together or constituting parts of a common scheme or plan." The district court rejected Randazzo's motion to sever based on Rule 8(a), and, as the issue turns on a construction of the rule, we review the decision de novo. United States v. Yefsky, 994 F.2d 885, 895 (1st Cir. 1993).

Rule 8(a)'s joinder provision is generously construed in favor of joinder, United States v. Robichaux, 995 F.2d 565, 569 (5th Cir.), cert. denied, ___ U.S. ___, 114 S.Ct. 322 (1993), in part because Fed.R.Crim.P. 14 provides a separate layer of protection where it is most needed. Under Rule 14, the trial judge has discretion to order severance of counts, even if properly joined under Rule 8(a), to avoid undue prejudice. Here, the district court denied Randazzo's motion for severance under Rule 14 and he has not appealed that ruling. Nevertheless, Rule 8(a) does forbid joinder unless the counts meet one of the conditions already quoted, and those conditions, although phrased in general terms, are not infinitely elastic.

One basis for joinder, invoked by the government here, is where the counts involve acts comprising parts of "a common scheme or plan." As the government points out, this rubric is often used to join false statement claims with tax fraud charges where the tax fraud involves failure to report specific income obtained by the false statements. E.g., United States v. Whitworth, 856 F.2d 1268, 1277 (9th Cir. 1988), cert. denied, 489 U.S. 1084 (1989). Indeed, the failure to report may help conceal the fraud.

The present case is quite different and offers no such connection between the shrimp and tax counts. Randazzo reduced the Company's reportable income by overstating corporate expenses. But it was pure happenstance whether the overstated expenses happened to reduce legal income or illegal income of the Company. The misconduct underlying the shrimp counts and the improper claiming of expenses on the returns were not part of the same "scheme or plan" in any sense of the phrase. Accord United States v. Halper, 590 F.2d 422, 429-30 (2d Cir. 1978) (rejecting a similar argument by the government).

Alternatively, the government says that the shrimp and tax charges are of the "same or similar character" because (ignoring sales to commercial buyers) both sets of offenses involved the use of falsehoods or omissions to profit at the expense of the federal government. Further, it notes that many facts are common to both sets of charges: for example, they occurred during overlapping time frames; Randazzo's control over the Company was a common element; and the Company's sagging financial condition provided a common motive.

It is obvious why Congress provided for joinder of counts that grow out of related transactions — ones that are "connected" or "part of a common scheme or plan"; the reason for allowing joinder of offenses having "the same or similar character" is less clear. But whatever the rationale, we think that it is very hard to describe adulterating or mislabeling shrimp as offenses "similar" to tax fraud — except at a level of generality so high as to drain the term of any real content. Even the government's best case does not stretch as far as the present facts. United States v. Levine, 983 F.2d 165, 167-68 (10th Cir. 1992) (bank fraud and mail fraud).

As to the presence of evidence common to both sets of counts, we agree that the extent of common evidence plays a role in implementing Rule 8(a). United States v. Taylor, 54 F.3d 967, 973 (1st Cir. 1995). But Congress did not provide for joinder for unrelated transactions and dissimilar crimes merely because some evidence might be common to all of the counts. Indeed, looking to the important evidence, the shrimp and tax counts in this case seem to revolve around quite different facts.

But all this is largely for the benefit of district courts in future cases, because the misjoinder here was patently harmless. United States v. Lane, 474 U.S. 438, 449 (1986). The evidence against Randazzo on the tax counts was overwhelming. Randazzo does not seriously claim otherwise but argues that the evidence on the shrimp counts was thin and that the jury was, or may well have been, swayed on those counts by the evidence (inadmissible save for the joinder) that Randazzo was cheating on taxes.

We disagree, concluding that the government has amply carried its burden to show that the error did not "substantially influence the jury's decision." O'Neal v. McAninch, ___ U.S. ___, 115 S.Ct. 992, 995 (1995). As to each of the four conspiracies charged in the shrimp counts, at least one high-ranking Company official testified that he had discussed with Randazzo the fact that the given ingredient was prohibited or had to be disclosed, and each testified that Randazzo had nevertheless ordered that the ingredient be added, making clear in several cases the aim was higher profits.

Other evidence showed that Randazzo kept close watch over production and had the final say over the mix of ingredients. In one instance Randazzo learned that another producer had been told to stop using an ingredient and, on investigating the report, Randazzo discovered that the ingredient could be used to change the color of the shrimp to resemble a more expensive variety; he then ordered its use in his own shrimp. Randazzo also played a major role in arranging for the destruction of evidence. The tax counts simply did not matter.

II. MULTIPLICITY

Randazzo's second claim of error, relating both to the indictment and to the jury instructions, is that the four alleged conspiracies should have been charged as one. He argues that, when coupled with the misjoinder, this multiplicity contributed to the impression that he was criminally disposed. Briefly, these were the four alleged conspiracies:

1. Count 1 charged that Randazzo conspired to make false statements to, and claims against, the government by selling the Department of Defense shrimp containing the chemical sodium tripolyphosphate ("STP"), in violation of contract obligations. STP causes shrimp to absorb and retain moisture, which in turn boosts profits because the shrimp was sold by weight.

2. Count 52 charged that Randazzo conspired to sell to the public shrimp that had been adulterated by adding saccharin, an additive prohibited by federal regulations. The government alleged that the Company added saccharin to mask the taste of the STP.

3. Count 65 charged that Randazzo conspired to add the chemical sodium hydroxide to certain types of shrimp in order to give them a pinkish color. Randazzo then passed off the altered shrimp to customers as naturally pink shrimp, which is rarer than other varieties and commands higher prices.

4. Count 79 charged that Randazzo added STP to the Company's line of frozen raw breaded shrimp, sold to wholesalers and the public, contrary to federal regulations.

It is a recurring question in conspiracy cases whether related illegal agreements comprise one conspiracy or several. Because the agreements are often not explicit and are regularly inferred from conduct, the courts ordinarily treat the issue as one of fact and offer various criteria that might help the factfinder distinguish: these include commonality vel non of the nature, motive, design, implementation, and logistics of the illegal activities, as well as the scope of co-conspirator involvement. E.g., United States v. Boylan, 898 F.2d 230, 241 (1st Cir.), cert. denied, 498 U.S. 849 (1990).

Each of the conspiracies in this case had a different specific purpose; each involved different conduct; and the time periods covered were different. Randazzo makes no effort whatever to dispute these differences in his brief. Rather, he says that all of the agreements concerned the Company's production of shrimp and alleged fraudulent concealment, and he points to some common elements ( e.g., that two of the conspiracies related to use of STP — one on military sales and the other on sales to the public).

We will assume arguendo that a jury might have found that there was an overarching conspiracy to sell shrimp through various deceptive practices that were altered from time to time. But on the evidence presented, the jury was not compelled to so find, and that is enough. As it happens, such an overarching conspiracy, if it existed, might not preclude the conviction of Randazzo for the individual subsumed conspiracies if they were also proved — an interesting problem that need not be decided here. See United States v. Broce, 488 U.S. 563, 580-81 (1989) (Stevens, J., concurring).

Randazzo continues by arguing that the four charged "overlapping conspiracies" worked special prejudice in this case. He points out that each conspiracy count alleged several different illegal purposes ( e.g., count 1 alleged violations of 18 U.S.C. § 287, 1001, and 1516). And, he concludes, the conspiracy counts together involved instructions on 17 different offenses. The result, says Randazzo, was "a lengthy and confusing [set of] instruction[s] that the jury could not reasonably be expected to apply."

Jury confusion is a legitimate concern in this case, but it cannot be proved by simply noting the number of offenses. There is no automatic ban on multiple counts in an indictment, or on charging a conspiratorial agreement having multiple unlawful purposes. Braverman v. United States, 317 U.S. 49, 54 (1942). Randazzo had a chance to show us how specific language or organization of the instructions misled the jury; but his brief points to nothing specific, let alone to any properly preserved objection or request concerning this issue.

III. "OTHER CRIMES" EVIDENCE

At trial the prosecution introduced some evidence suggesting Randazzo's involvement in previous, uncharged misbranding, adulteration and tax fraud offenses. On appeal Randazzo does not challenge the admission of this evidence. But he claims that the trial court should have given a requested standard instruction that evidence of uncharged crimes may not be considered as evidence of his propensity to commit crimes. Fed.R.Evid. 105, 404; see 3 L. Sand, et al., Modern Federal Jury Instructions Section(s) 74.03 (1994).

The government's response is that most of the evidence characterized by Randazzo as "other uncharged conduct" was "direct evidence of the crimes charged, not Rule 404(b) evidence at all, and thus did not require the limiting instruction defendant proposed." The government includes in this "direct evidence" category the Company's use of sugar and STP in shrimp in years prior to the indictment and evidence of Randazzo's failure to report income ( e.g., the cash he took from the Company) on his personal tax returns. In an appendix to this opinion, we set forth the episodes that are arguably in dispute.

Our case law does contain such a distinction between "direct evidence" and "other crimes" or "Rule 404(b)" evidence. E.g., United States v. Santagata, 924 F.2d 391, 393-95 (1st Cir. 1991). Although its soundness has been questioned, E. Imwinkelried, Uncharged Misconduct Evidence Section(s) 9.62 (1995), we are not free to disregard circuit precedent. But in reality "direct evidence" and "Rule 404(b) evidence" are not mutually exclusive categories, but loose labels that can sometimes plausibly be applied to the same conduct. And, as usual, below the surface there are problems of policy and of degree.

The general rule is that evidence of the defendant's bad acts or crimes, other than those charged in the indictment, is admissible, subject to conditions, if relevant in some way apart from the forbidden inference that the defendant is criminally inclined. Rule 404; see People v. Zackowitz, 172 N.E. 466, 468 (1930) (Cardozo, J.). The standard conditions include the usual balancing of relevance against prejudice, Fed.R.Evid. 403, and use of a limiting instruction telling the jury not to draw the forbidden inference, Fed.R.Evid. 105. See Huddleston v. United States, 485 U.S. 681, 691-92 (1988).

The general rule, and the conditions, may be easily applied where the "other" crimes are reasonably distinct ( e.g., in time and place) from the crime charged in the indictment. But where the "other" crimes are more closely entangled with the events that comprise the charged offense, a number of courts have declined to apply the label "other" or to require the limiting instruction. E.g., Santagata, 924 F.2d at 395, (evidence that those charged with drug dealing had been carrying guns).

The argument for the distinction made by cases like Santagata is that where the "other" ( i.e., uncharged) crimes are closely entangled with the crimes charged, the strength of the permitted inference — e.g., that guns are often used to protect drugs — may effectively submerge the forbidden one. See Rossetti v. Curran, No. 95-1978, slip op. at 13 (1st Cir. March 21, 1996). The argument against the distinction is that sometimes the forbidden "bad character" inference remains a potential menace even in cases like Santagata. Obviously much depends on the crimes involved and on the facts of the individual case.

In the present case, at least one or two categories of the "other" crimes described in the appendix were distinct enough from the crimes actually charged that it would have made sense to include a single general limiting instruction in the final charge to the jury. Nothing more was sought in this case. Perhaps the safe course for a district court, wherever the matter is in doubt, is (where asked) to give a closing general instruction that bad character is not a permissible inference.

But here a limiting instruction could not have altered the result and omitting it was at worst harmless error. United States v. King, 897 F.2d 911, 915 (7th Cir. 1990). The most potent "other crimes" evidence related to Randazzo's personal tax offenses; but the evidence against Randazzo on the corporate tax offenses was overwhelming. Conversely, the arguable "other crimes" evidence bearing on the shrimp counts was either very mild or so similar and closely connected to the actual crimes charged as largely to rob it of the independent "bad character" sting which the instruction means to forestall.

IV. MATERIALITY

Randazzo claims that on six counts, each involving some form of false representation or omission, the trial judge erred in deciding that the statements or omissions were "material" instead of submitting the materiality issue to the jury. Two counts (counts 1 and 65) charged Randazzo with conspiring inter alia to make false statements to the government in violation of 18 U.S.C. Section(s) 1001; and the four tax counts (counts 98-101) alleged that Randazzo willfully overstated expenses on the corporate tax returns in violation of 26 U.S.C. § 7601(1).

At the pre-charge conference Randazzo said that the materiality issue in count 1 was an issue for the jury. But, as was then common in most circuits, e.g., United States v. Arcadipane, 41 F.3d 1, 7 (1st Cir. 1994), the trial judge ruled that materiality was for the court and held that the materiality requirement was satisfied as to count 1. We think that she also decided the materiality issue on the four tax counts. As to count 65, the judge did (for unexplained reasons) submit the issue of materiality to the jury.

Following Randazzo's conviction in October 1994, the Supreme Court in June 1995 decided United States v. Gaudin, ___ U.S. ___, 115 S.Ct. 2310 (1995), and held that where materiality is an element of a crime, it must be submitted to the jury. In this circuit, both of the offenses in question have been read to include a materiality requirement. Accordingly, as Randazzo is entitled to the benefit of the law prevailing at the time of his appeal, Griffith v. Kentucky, 479 U.S. 314, 328 (1987), it was "error" as to five of the six counts in question (counts 1 and 98-101) not to submit the materiality issue to the jury.

If the harmless error test were applied, Randazzo would arguably be entitled to a new trial on these counts, even though the error did not affect the outcome. This court has held that the failure to submit an entire element to the jury, when a properly preserved request is made, is treated as "structural" and is reversible error without regard to harm. United States v. Lopez, 71 F.3d 954, 960 (1st Cir. 1995) (reading Supreme Court precedent to point in this direction). Accord, DiRico, slip op. at 12, 78 F.3d at 737.

At the same time, this court observed in Lopez that a Gaudin error would not require automatic reversal if the defendant had failed to preserve the objection at trial. Rather, we said that the test on review would be the customary "plain error" standard under United States v. Olano, 113 S.Ct. 1770 (1993); Lopez, 71 F.3d at 960. Significantly, every post- Gaudin case we can find in other circuits does apply the plain error test, not the harmless error test, to a failure to submit materiality to the jury (assuming that the objection was not properly preserved).

Here, Randazzo did not preserve the objection because he failed to object to the instructions on this point after they were given and before the jury retired. See Fed.R.Crim.P. 30. Randazzo says that it was reasonable not to object since First Circuit precedent was dead against him and Gaudin was unexpected. This is so; but the question is whether these circumstances make any difference. In United States v. Collins, 60 F.3d 4 (1st Cir. 1995), this court squarely held that it does not make any difference, and the post- Gaudin cases in other circuits imply the same view.

This result might at first be surprising, but we are dealing with an accommodation of conflicting concerns. Randazzo is not charged with a deliberate waiver of the objection, which might preclude its consideration under any standard. E.g., United States v. Marder, 48 F.3d 564 (1st Cir.), cert. denied, ___ U.S. ___, 115 S.Ct. 1441 (1995); see also Olano, 113 S.Ct. at 1777. And, although the trial judge in this case acted properly under then prevailing law, Randazzo is given the benefit on direct review of a later change in law — if he can meet the customary plain error tests that Olano sets forth unpreserved error. In any event, Collins controls.

In this case, even assuming the error was "plain" and "affected substantial rights," Fed.R.Crim.P. 52(b), it did not cause a "miscarriage of justice" or seriously affect the integrity or impair "public confidence" in the proceedings. Olano, 507 U.S. at 736-37, 113 S.Ct. at 1779; Keys, 67 F.3d at 811. On the tax counts, the convictions were inevitable. Although Randazzo's brief struggles imaginatively to find a doubt based on the amount of the misreported expenses in comparison with corporate income, the amount (between $45,000 and $60,000 each year) was not trivial or immaterial, even assuming dubitante that amount matters in the case of a deliberate falsification. Compare United States v. Greenberg, 735 F.2d 29, 31 (2d Cir. 1984).

As for the use of STP in shrimp — forbidden by the Company's government contracts — the prosecution offered evidence that STP increased the weight of the shrimp (apparently by more than five percent) and therefore the cost to the government. In fact, the prosecution showed that in one instance where the presence of STP was revealed, the government rejected the Company's shipment. Given the contract ban and the increased cost, the failure to reveal the use of STP was patently material.

V. PROCESSING AID

The last issue concerns Randazzo's claim that the court misinstructed the jury on the definition of "processing aid," a term pertinent to the misbranding offense in this case. Count 65 charged Randazzo with conspiring to sell, and counts 66-78 with selling, shrimp that was misbranded; and one of the three forms of misbranding charged (any one sufficed for conviction) was that the label inaccurately failed to list sodium hydroxide as an ingredient. The statute, 21 U.S.C. § 343(i)(2), provides that failure to list an ingredient constitutes misbranding unless the omission is exempted by regulation.

Sodium hydroxide had clearly been added to the shrimp in question, but it was Randazzo's position that this ingredient did no more than bring out or restore the allegedly natural pink color of the shrimp and that the ingredient was exempted from listing as a "processing aid." The regulation exempting "processing aids" defines them to include the following:

Substances that are added to a food for their technical or functional effect in the processing but are present in the finished food at insignificant levels and do not have any technical or functional effect in that food.

21 CFR Section(s) 101.100(a)(3)(ii)(c).

In charging the jury, the trial court did not read this quoted language verbatim, although Randazzo had asked for such an instruction. Instead, the court told the jury that the jury could find misbranding if the label failed to list each ingredient but, "if an ingredient is merely a processing aid, it does not have to be listed. However, if the ingredient has a functional or technical effect on the product, such as changing its color, it is not a processing aid and it must be listed as an ingredient."

Following the charge, the court invited objections. Randazzo did not object to the failure to read the verbatim definition of processing aid, and the omission was not plain error. See Fed.R.Crim.P. 30. But his counsel did say: "I object to the use of the phrase 'changing its color' in connection with the standard of identity." Despite the garble (the "standard of identity" concept related to a different set of counts not involving color), we think that the district court likely understood the thrust of the objection.

This takes us to the question whether the district court was right in glossing the regulation to exclude from the definition of "processing aid" an ingredient that "change[s] [the food's] color." However, Randazzo offers nothing — by way of textual analysis, precedent, administrative interpretation, policy argument, or anything else — to support his underlying position, namely, that an ingredient that merely brings out a supposedly natural color is a processing aid.

The government's reading of the regulations is not self-evidently wrong; indeed, the government now suggests that the "change of color" instruction was actually too favorable to the defense (but the government proposed the language). In all events, it is the appellant's responsibility to make some showing that an error has been committed. United States v. Hurley, 63 F.3d 1, 11 (1st Cir. 1995), cert. denied, Saccoccia v. U.S., ___ U.S. ___, 116 S.Ct. 1322, ___ L.Ed.2d ___, (1996). We have no basis here for finding that the instruction was error and that is enough to decide this case.

Affirmed.

APPENDIX

The following briefly describes the evidence of uncharged wrongs admitted at trial:

1. There was evidence that the Company used sugar in processing shrimp for an unspecified period before it was discontinued in favor of saccharin in 1989. No one testified expressly that this use of sugar was illegal, but this was a likely inference, given that the evidence showed the sugar was not identified on the product label and that sugar was among the ingredients concealed by falsified brine charts.

2. Testimony showed that STP was used in the Company's frozen breaded shrimp from the 1970s, in violation of federal regulations and government contract provisions. This conduct clearly preceded the indictment period for count 1, which began in 1989, although the government argues that it was within the scope of the allegations in count 79, which stated that the additive had been used in commercially sold shrimp "from a time not known to the grand jury but at least June 1983."

3. There was evidence that, during the years alleged in the tax counts, Randazzo failed to report as income on his personal tax returns both the cash sums he allegedly took from the Company's retail store and the personal services provided by an assistant at Company expense.

4. Testimony by a Company accountant tended to show that Randazzo engaged in the corporate tax count offenses prior to the indictment period. Specifically, the accountant told Randazzo in a 1985 conversation that something was suspect about the bookkeeping for the cash retail sales of shrimp, and also inquired as to what Company services were being performed by the Randazzo family assistant. Randazzo allegedly told him it was none of his business.