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yields True if e1 contains only elements that appear in e2.
is an operator form that yields True when the object to which it is applied contains only elements that appear in e2.
The first list contains only elements in the second list:
The first list contains elements not present in the second list:
ContainsAll ContainsNone ContainsAny ContainsExactly MemberQ FreeQ Complement Intersection
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