The 3 letters of the word hat plus one additional letter can create
many new valid English words e.g. heat, Utah etc.

a. How many?

b. Same question for "hat+2": like yacht, Tahoe etc.

Rem: The additional letter(s) may be (not need to be) one(or two) of the h,a,t letters, in case b. nothing precludes adding twice the same letter.

(In reply to some computer findings by Charlie)

I notice that the count (ct) variable is not reinitialized to zero, so the count of 143 at the end includes the 36 from part a as well as the words in part b.

Posted by Charlie on 2015-01-28 07:37:28