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sideshow overlapping understudied piggy bank bluegrass designated hitter pinch hitter safe-deposit choirmaster fail-safe reserves backing up additional easement embossment emergency endorsement figurehead fireman hand help hodman lieutenant line deputy copy aid alternate alternative appointee assist assistance auxiliary bolstering buttressing changeling cooperator locum tenens ministration secondary secondaries stand-by sub substituent substitution substract succedaneum succorer supplanter supplemental