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Determine if a word or phrase is an isogram.
An isogram (also known as a "non-pattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.
Examples of isograms:
The word isograms, however, is not an isogram, because the s repeats.
Isogram is featured as part of #48in24 challenge. Solve it in AWK, Prolog, and Rust to earn the gold award.
You've not yet completed it in any languages.
