Number of different letters

A code to compute the number of different letters a word has is desired. Write a function @num_dif_letters_list(f)@ that provided a list of words $f$ returns a list of numbers. Each number in the result list has to be the number of different letters of the corresponding word in $f$ . All words in $f$ consists of lowercase letters.

Sample session

Problem information

Author: ProAl

Generation: 2026-01-25T15:26:42.505Z