12 2 3 ASAAAS sss SAS ABC A B C A B AB A A B B A B C ABC 1 ASA 1 OAB A B OAB OA OB AOC BOD AOC BOD A BOA OB 1 2 AOC BOD ASA 2 DAB EAC BECDO AB AC B C AD AE ADC AEB A AAC AB C B ADC AEB ASA AD AE AB AC BD CE 1 BD CE 2 1 2 ABC DEF A D B E BC EF ABC DEF 2 A D B E BC EF ABC DEF A D B E C 180 A B F 180 D E C F ABC DEF ABC DEF ASA AAS ABC DEF ABC DEF AAS 2 1 2 C D AD AC ABD ABC ABD ABC AAS AD AC 1 1 2 ABD ABC AD AC ABD ABC ABD ABC ASA AD AC 2 1 2 3 4 AD AC 3 4 ABD ABC ABD ABC ABD ABC ASA AD AC 1 1 AOC BOD A B AC BD C D AOC BOD ASA AOC BOD 2 A B AOC BOD CA DB ADC BOD AAS AOC BOD AB BC AD DC 1 2 AB AD 2 A B ABBFC D BC CD BFDE A C E DEAB 1 2 3