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Normal < Conservative < Strict < Rigorous.

1) In Rigorous 2PL, a transaction does not release any of it's locks until after it commits.

2) In Strict 2PL, a transaction does not release any of it's exclusive lock until after it commits.

This makes R-2PL more strict than S-2PL.

3) Conservative 2PL has no such lock release restrictions.

4) And Normal 2PL is the simplest one.

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