Until I find out the official name for such things, let us say
a *unigram* is a word in which no letter is repeated.

Thus *cat* and *dog* are unigrams, but *cattle*
and *turtle* are not, in both cases because the letter
**t** is repeated. The definition ensures that a unigram can't
be longer than 26 letters; it's easy to imagine that that are unigrams
of 7, 8 or 9 letters, but the limit must not be far above that!

Can you come up with a unigram of 8 letters? What about 9 or 10? What is the longest unigram you can come up with?

I give up, show me the solution.