Q: Mary tucked her daughter Anne into bed, so that *she* could sleep.
Are "Mary" and "she" the same?
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A: no

Q: Mama came over and sat down beside Alice . Gently she stroked *her* hair and let the child weep.
Are "Alice" and "her" the same?
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A: yes

Q: There is a pillar between me and the stage , and I can't see *it* .
Are "the stage" and "it" the same?
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A:
yes