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Recap
Using sets to compute unique elements
Set operations
Simulating machines
Summary
14. Question 1

Instruction

A letter bank of a word is the set of unique letters in this word. For example, the letter bank for "Mississipi" is "ismp" and the letter bank for "road" is "adro".

Exercise

Write a function called count_letter_banks(words) which, given a list of words, computes the number of different letter banks for words in the list.