Question: An isogram is a word or phrase without a repeating letter. Vito and Kira are playing a guessing game involving isograms. Vito thinks of a

An isogram is a word or phrase without a repeating letter. Vito and Kira are playing a guessing game involving isograms. Vito thinks of a word with no repeated letters. He tells Kira that his word can be used to make 42 letter pairs. He gives LS, OG, and GO as examples. How many letters are in Vito's word?
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