30 50
DCC DCC DCC DDB DDB DDB DDC DDC DDC DDC DDD DDD DDD DDD DDD DDD DDD DDD DDD DDD BB BB BB CB CB CC CC CC CC CC DB DB DC DC DC DD DD DD DD DD DD B C C D D D BCAADDDDDDDDDDDDDDDDDDDDDDD BCADBDDDDDDDDDDDDDDDDDDDDDD ABCCDDDDDDDDDDDDDDDDDDDDDDD 
BAA BBA BBB AAA CAA CCA AAA BAA BBA BBB AAA BAA BBA BBB CAA CBA CBB CCA CCB CCC AA CA DA AA DA AA BA BB DA DB AA CA AA BA BB AA BA BB CA CB CC A A B A B C DABCCDDDDDDDDDDDDDDDDDDDDDD BDADDDACDDDDDDDDDDDDDDDDDDD ADBBDDDCDDDDDDDDDDDDDDDDDDD