    Sentence 1: In 2012-13, ABC debuted a  comedy Last Man Standing starring who?    Sentence 2: Shark Tank (based on the  Dragon's Den reality format) also became  a midseason sleeper hit on Sundays in the  spring of 2010; the following season, it  became the tentpole’ af: the network's  Friday night schedule}: gradually helping  make ABC a strong competitor (after  being paired with.20/20 and beginning  with the 2012-13:season, the Tim Allen  sitcom Last Man Stéfiding) against CBS"  long-dominant drama/reality lineup on    