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(a) Query(s1) | Query(s2) & ~ Query(s3);

The expression create 1 OrQuery object, 1 AndQuery object, 1 NotQuery object and 3 WordQuery objects.

Query --> OrQuery --+--> WordQuery(s1)
                    |
                    +--> AndQuery -----+--> WordQuery(s2)
                                       |
                                       +--> NotQuery -----> WordQuery(s3)

(b) Query(s1) | (Query(s2) & ~ Query(s3));

The expression create 1 OrQuery object, 1 AndQuery object, 1 NotQuery object and 3 WordQuery objects.

Query --> OrQuery --+--> WordQuery(s1)
                    |
                    +--> AndQuery -----+--> WordQuery(s2)
                                       |
                                       +--> NotQuery -----> WordQuery(s3)

(c) (Query(s1) & (Query(s2)) | (Query(s3) & Query(s4)));

The expression create 1 OrQuery object, 2 AndQuery objects and 4 WordQuery objects.

Query --> OrQuery --+--> AndQuery --+--> WordQuery(s1)
                    |               |
                    |               +--> WordQuery(s2)
                    |
                    +--> AndQuery --+--> WordQuery(s3)
                                    |
                                    +--> WordQuery(s4)