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Perfect Words
A PERFECT WORD is a word in which ANY one letter could be replaced by another letter to form another word.
An example of a 4-letter Perfect Word is CAST because C could be replaced by L to form LAST or A by O to form COST, or S by R to form CART, and T by E to form CASE.
Warm Up Exercise : Give a 5-letter Perfect Word.
Challenge : Give a 6-letter Perfect Word.
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