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

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