Let's say that I have these two lists of Persons. The Person object has FirstName, LastName, and Age properties.

List A
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David Smith, 38
David Smith, 38
Susan Johnson, 23

List B
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David Smith, 38
David Smith, 38
Susan Johnson, 23
Daniel Wallace, 55

I want to see if A is a subset of B by comparing the three properties. No, in this case I do not have a unique ID for each person.

EDIT: There can be duplicates in List A (David Smith, 38). List B should have the duplicates for it to qualify as a super set of B.