/\abcd
a*bc*(ab)+
/\/\/ bacbbcdaccabbcaddabc
/\/\/ aadbcbadbbbbdbaaacaa
/\/\/ cadcacccbdabccbdcbcd
\ abaadbdbabbabdcaadba
/\/\/ dbdbacaccdccabccbacd
/\/\/ adcacbaccccbbbdbbbdb
/\/\/ bbdacaccbdccddabacdc
\ ddcbaabdcbabdabddbdc
/\/\/ cbacbcbaaddbcaaabccd
/\/\/ adbcdbacbbaccbcadbdd
/\/\/ cbaaaaccadcbdadcbaac
/\/\/ bcdbdbdacaccacaacddd
/\/\/ acdabdcbacbbbccdbcda
/\/\/ abbcbcaacbbccbdcbcbc
/\/\/ ccabadbccccbacdbaddb
/\/\/ baabadbcbcbdcaccaaaa
\ bdacaababdbbcaccadaa
\ ccababdbabbacbcbdddd
\ ddcaaaabdbcddbabaddd
\bdbadbaacdbbcbbbbabd
/\/\/ acbbccbbdacbddabdcad
/ccaddccbbbacbdadbaba
/ cbcdababbdbdbaacbcda
/\/\/ cddcbacdaacbbbdddbbc
/\/\/ bcbaabcccaddaaabbacd
/\/\/ ddbacdccccdadbdcacdc
/\/\/ bcdbdcaaacdaddabccbd
/ bddcdbabbacdbacdddab
/\/\/ bbaaabbcaacdbbccddaa
/\/\/ cadddddbdabaddaaacdc
/\/\/ ccccbdddcdacdbaabcac
/\/\/ acdbcdadabdbbcbcdacb
/\/\/ cadabacbbdcabcdadcca
/\/\/ ddbcbadddacaaaacbada
/ babddaaabbbacdccbaac
/ dabaaccabababcdcbbad
/\/\/ cdbcbbbcadcddaccdbca
/\/\/ aaadcacdcabaabaadbcb
/ bcabbddbbbcbacacaddc
/\/\/ dbadaddcaaaaaaadaaba