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Question:

Waste product of a fuel cell?

For a crossword/homework. :311 letters long, ends in 'r', 9th letter is 't'.

Answer:

Could it be liquid water? 'cause it's either liquid water or gaseous water, depending on the temperature of the outtake, if it's a hydrogen fuel cell.
Well the waste product of a fuel cell is water, but how you get that into 11 letters I don't know

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