a-a a-b a-c aaa aab aac aak ab- aba abb abc abk ac- aca acb acc ack aka akb akc akk baa bab bac bak bba bbb bbc bbk bca bcb bcc bck bka bkb bkc bkk c-- caa cab cac cak cba cbb cbc cbk cca ccb ccc cck cka ckb ckc ka- kaa kab kac kak kba kbb kbc kbk kca kcb kcc kck kkb kkc kkk

a-ak aaaa aaab aaac aaba aabb aabc aaca aacb aacc aack aaka abaa abab abac abak abb- abba abbb abca abcb abcc acaa acab acac acba acca accc akaa akca akka baaa baak baba babb bac- baca bacc back bak- baka bbbb bcaa bcbc bcca bccc caaa caab caac caba cac- caca cacc cack caka cbac cbbc cbca cbcc cbka ccaa ccab ccac ccba ccbc ccca cccb cccc ckac ckbc ckck kaaa kaab kaak kaba kabb kabc kacb kacc kaka kakc kakk kbaa kbab kbac kbak kbba kbbb kbbc kbbk kbcb kbck kbkb kbkk kcaa kcab kcac kcba kcbc kcbk kcca kccb kccc kcck kckc kckk kkaa kkac kkba kkbb kkcb kkck kkkk

-aaa- aabaa aabba aacbc abaab ababa abaca aback abaka abbac abccc acaca acacb acack akaba babak babka bacab bacca back- backa bakka c-a-c ca-ca caaba cacak ccccc kaaba kabaa kabab kabak kabba kakka

aaaaba abacab ackack akbaba akkaba baabaa bacaba bbbbbb caback cakcak kaback kabaka kakkak

ack-ack bac-cab bbbbbbb cabback kacabac

bbbbbbbb

abakabaka baabaabaa

aaaaaaaaaaaaaaa bbbbbbbbbbbbbbb ccccccccccccccc