15 C C C A B 610 D A A C C 1115D A B A C 1620 C A C D A 2125D A A C A 2630 C D C B C 3135 ?????3640 ????? 4145 ?????4650?????
?????????????50??2 ?????15 D C C D D 610 A A C A A 1115C B B B B 1620 C B D B D 2125B D B A C 2630 B A D D B 3132 B D 3337 ????? 3842 ?????4347 ????? 4850 ???