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The table summarizes the set membership operators available in APL. These operators filter records based on whether a value matches any element in a specified set.

Name	Description	Case-sensitive
in	Returns `true` if the value equals any of the elements.	Yes
!in	Returns `true` if the value doesn’t equal any of the elements.	Yes
in~	Returns `true` if the value equals any of the elements.	No
!in~	Returns `true` if the value doesn’t equal any of the elements.	No

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Set membership operators