That's the point. You're being asked the same question multiple ways with different correct answers, presumably to catch liars and criminals in the act?All of the new questions on 4473 are unnecessary. Criminals will just lie. The system isn't 100% reliable anyway.
And is it just me or is 21b redundant?
(21b: Do you intend to purchase or acquire any firearm listed on this form and any continuation sheet(s) or ammunition, for sale of other disposition to any person described in questions 21(c)-(m) or to a person described in question 21.n.1 who does not fall within a nonimmigrant exception)
Frankly, if they never add another "yes" answer, the form gets filled out the same way every time anyway.. yes, no no no no no.....