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Also, Team Fail, in your example you showed, you gave us the word "chap" as a word example whose any single letter cannot be changed/removed or as a word which cannot be added a letter to to form a new word anymore. But just in case you didn't know, you could still change chap to char or chap to cap. -.-
Actually, there's a lot you could do with Chap. Perhaps Team Fail just . . . well, didn't feel like finding an unchangeable word? You can change most any word . . . some people just don't try, lol.