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If the sizes of two sets of things are the same, we say they have the same cardinality.
This means each value in one set has a matching value in the other set and there are no leftovers in either one.
LET'S TRY THIS:
If you pick a value xx from the first row, what can the corresponding value from the second be?
(Remember, for this to work, every value from the first row has a match in the second, with no terms left out of either row.)
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