not x in changed to x not in

[Srishti-Ahuja]

Description

Changed instances of 'not x in' to 'x not in' as suggested in the issue FLK-E713 (Test for membership should be 'not in')

Fixes #FLK-E713

Replace issue_no in the above line, with the issue related to this PR.

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• [ ] New feature (non-breaking change which adds functionality)

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