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If a fast day which normally falls out on shabbos is pushed off, such as the 17th of Tammuz, and a person fasts on that shabbos for another permissible reason, such as a taanis chalom (fast for having a bad dream) is that person exempt from fasting the following day - ie the nid'che 17th of Tammuz fast?

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The Ben Ish Chai in Rav Pealim (chelek alef question 29) cites the masat binyamin among others as indicating that you would have to fast on 17 Tammuz because anyway a person is obligated to fast a second time for having violated oneg shabbos by fasting on shabbos - even though he is permitted to fast for a tanit halom. See Orah Hayim 288