Quiz Guy John Chaneski donated blood the other day, which inspired this week’s puzzle based on the four blood types, A, B, O, and AB. Each clue involves a pair of words, and the challenge is to donate one of those four blood types to one word to make it synonymous with the other. Take, for example, the words ruble and debris. The addition of which blood type to the first word makes it mean the same thing as the second?

This is part of a complete episode.

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