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there know that isogram means “equal letter.” An isogram is a word that has an equal amount of each letter in it. For starters, let’s discuss first-order isograms, which do not repeat any letter. My name, “Curtis,” is a first-order isogram. So are the words “customizable,” “nightwalkers,” “flamethrowing” and “ambidextrously.” None of these words use the same letter twice! The longest English language isogram, weighing in at 17 letters, is “subdermatoglyphic,” which has to do with certain patterns in our fingerprints (I think). Y