30 50
CCDBCACDCADBCABCBDC BDCBACADCDBAA DABBAAA DBCCADBDCDBB BBCCCABDCDDDCDBCDCBDCDBBAA CBDDCDAD DADDADDADCDADDBDCBACCBBBBCDCBC ABACBBBACDCBCBACBCAABCBDAB ADACDDBDC BACDBBBADBDCADBACA CDBC CBAD CDBBAB DDDDADCACBCB BCCCCAD CBCDBABABBBDCDCADCBADDBDBD CDDADCDCCBCBBDA DDBCCCDBACBCABAABACB CADAD BCB DCDDDDCBBC ADB CBACDCBCDBDABABCCAD ABBDDABDAABBBADC BABD C BCCCCCCBABACBADBACCCAD ABBABBCABCCABADCDBDDCDABADD BBDBDADBACDADCBADCBDCAD CBBAAACCBA ACCDDADBCBDACCBCADAACCBADAAADA BCCBDADBBCDB CCBBDCCDDBBACDDD DAACCDDDBDDAAABCCBCB A CCDBDCBDADCBBBBCBDCBDBC BABACCDDCBBDBBADDCBCBAA CDBDDCABBBBADADDCADDACAC CCCCBDDBADCDDAB BADBAADBBBCCAABBDBDBBACB DDDC CBCCCCDDADDAABDACCDDBCCB ACBA CDADCDCCBDBCAA DBBCAADBABBBDDBDDBACA DCBCBDBADD AACBDACADBCDD BABBAADABCDBBBCAA BCDADABABDACDABC DCCBDAADBBCBBCBDA 
CCDBBACBCDDBBCAABCA DDDDABCBADBBD DDACDCA DBDBADDDACDD CCDCCBCABBCDCDCACADBDBDBCD CACDABDC DDCCBCDACDCDCCACDDABCCDACCBBDB CDDDBCCDADBDCADCCCADADABAA CCACCBBCA ADDABCCBDADDABBBCC CDBD CDBD BDCCBD AADCCACDBCDB BDAACBD CBADDDDCBCBDABACBADAADABCD CADCBDCAACADBCD CDBBABCBDADBCDDACBBC BCBCB CBA DBADCABACB BCB AABDBAADBCDABDBBDAD AACBBCCCBABCDBAA DBAA D CCADAAACCDDCADCABCCCBA DCCADDADBBCBCBADABACADBCDDA DCDCDBBCDAACDCCDABBDDCD DDCDACCABD DDBBBBACABDACAABCDACCBBCDADADB ADABBBBDBADD ADBBBDAACDACBCCA CAACCBCBDADBBACBBCBB C DACBCABDDBAABCBACBABCAA ADCDDBACDBBACAACACDCDDB CADBAACADDABAACCCBBDAADD ACBDBCDBBCDADAA ABBAACBBABAACACBCDADDBDA DDCA ABCDCABDCADBDDADACABDCBB DCCC CBBCBBABDDCBDD CAACDBADCCBACDCBDAADD ABBACAAABA ADBCDDDCBDCAA DDDBACCDCBCBCCBBC BDCCCDCCBABDDCCB AABDDCCACDDBCCDCA