Given that s1, s2, s3, and s4 are all strings, determine what objects are created in the following expressions:
(a) Query(s1) | Query(s2) & ~ Query(s3);
(b) Query(s1) | (Query(s2) & ~ Query(s3));
(c) (Query(s1) & (Query(s2)) | (Query(s3) & Query(s4)));
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