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a set of apples is compared to a set of oranges such that every fruit is used exactly once which shows these two sets have the same cardinality, even if one does not know how many of each there are. Thus, cardinality is measured by putting sets in so-called one-to-one correspondence: each object in one set can be assigned a dedicated "pair" in the other, and no object from either set left unpaired. If it is possible, the sets are said to have the same cardinality, and if not, one set is said

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