I have two columns and I want to count hwo many pairs I have of the same element. For example. If I have a = c(1,2,3,4,5) b= c(12, 1, 34, 2, 5, 0, 10, 100, 11) It should return 3 (since 1, 2 and 5 occur in both columns). Columns need not be of the same length.
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