Answer:
(a) \[\leftrightarrow \] 1, 2, 5, 6, 7 (b) \[\leftrightarrow \] 1, 2, 5, 6, 7 (c) \[\leftrightarrow \] 1, 2, 4 (d) \[\leftrightarrow \] 2 (e) \[\leftrightarrow \] 1, 4.
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