- - below zero (hint: the complete answer is an alternate title for this puzzle suggesting a letter that can fit in 10 squares, but has been dropped each time)
- - Universal donor's type
- - Universal donor type
- - So-called universal donor blood
- - Blood type of a "universal donor"
- - Blood type historically considered the universal donor
- - Kind of blood
- - uncommon bank deposit
- - It's rarely found in the hospital
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