a-a a-b a-c aaa aab aac aao ab- aba abb abc abo ac- aca acb acc aco aoa aob aoc aoo baa bab bac bao bba bbb bbc bbo bca bcb bcc bco boa bob boc boo c-- caa cab cac cao cba cbb cbc cbo cca ccb ccc cco co- coa cob coc coo oaa oab oac oao ob- oba obb obc obo oc- oca ocb occ oco oo- ooa oob ooc ooo

aaaa aaab aaac aaba aabb aabc aaca aacb aacc aaco aaoo abaa abab abac abb- abba abbb abbo abca abcb abcc aboa abob aboo acaa acab acac acba acca accc acco acoa aoba aoca baaa baba babb babo bac- baca bacc bbbb bcaa bcbc bcca bccc boab boac boba bobb bobo boca boco boob booc c-bo caaa caab caac caba cabo cac- caca cacc caco cbac cbbc cbca cbcc ccaa ccab ccac ccba ccbc ccca cccb cccc ccob ccoc coba cobb cobo coca coco coob obba obbo ocab ocac ocbc occa occc ooaa ooba oooo

-aaa- aaaoc aabaa aabba aacbc abaab ababa abaca abaco abbac abccc aboab abobo acaca acacb baboo bacab bacao bacca bacco bo-bo boaco bobac boboc bocac bocao bocca bocoa booba booco c-a-c ca-ca caaba cabob caboc cacao caco- cacoa caoba ccccc co-bo co-co cocao cocc- cocco cocoa cooba obaba ooooo

aaaaba abacab baabaa babaco bacaba baobab bbbbbb boabab boccob bococa booboo caccao cobbob cocco- cococo coocoo oooooo

bac-cab bbbbbbb boo-boo o-o-a-a

bbbbbbbb bo-bo-bo

baabaabaa

aaaaaaaaaaaaaaa bbbbbbbbbbbbbbb ccccccccccccccc