Starting with COLD, change one letter at a time until you have the word WARM.
Each change leaves the other letters in their original places and must result in a common word.
What is the minimum number of steps required to achieve this change?
COLD, CORD, WORD, WARD, WARM
COLD, CORD, WORD, WORM, WARM
COLD, CORD, CARD, WARD, WARM.
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