The argument works for all other N but fails in the basis case.

What, that argument doesn't work when the roles are switched?

I can't see this as a reasonable comparison, so your argument doesn't work for me.

Neither argument works particularly well for fashion designers who may have been in business only a few months.

But that argument would also work against the plaintiffs in the civil suit.

How long the argument will work remains to be seen.

This argument doesn't work, because many people are happy to go upstairs - and even prefer it.

This whole argument about good/bad publicity not making a difference only works if you don't have a mind of your own.

Yet this argument will not work with the later forces which struck deep inland.

Since the same argument works for any number, not just 20, the formula is established.