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One option – Jaccard coefficient
A commonly-used measure of overlap
Let X and Y be two sets; then the J.C. is

Equals 1 when X and Y have the same elements and zero when they are disjoint
X and Y don’t have to be of the same size
Always assigns a number between 0 and 1
Now threshold to decide if you have a match
E.g., if J.C. > 0.8, declare a match
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