02br 02br 00(a) 01b 00When02b 00 Susan returned home from the trip, she 01b 00brought02b 00 gifts to her friends. (01i 00returning 02i 00and01i 00 bringing02i 00 presumed simultanous)02br 02br 00(b)01b 00 When02b 00 Susan had returned from the trip, she 01b 00brough02b 00t the gifts to her friends. (01i 00returning 02i 00precedes 01i 00bringing02i 00)0-
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