a-a a-b a-c aaa aab aac aaf aak ab- aba abb abc abf abk ac- aca acb acc acf ack af- afa afb afc aff afk aka akb akc akk baa bab bac baf bak bba bbb bbc bbf bbk bca bcb bcc bcf bck bfa bfb bfc bff bka bkb bkc bkf bkk c-- caa cab cac caf cak cba cbb cbc cbf cbk cca ccb ccc ccf cck cfa cfb cfc cff cfk cka ckb ckc faa fab fac faf fak fba fbb fbc fbf fbk fca fcb fcc fcf fck ffa ffc fff ffk fka fkb fkc fkf fkk ka- kaa kab kac kaf kak kba kbb kbc kbf kbk kca kcb kcc kck kfa kfc kff kkb kkc kkk

a-ak aaaa aaab aaac aaaf aaba aabb aabc aaca aacb aacc aacf aack aafa aafb aafc aaff aaka abaa abab abac abaf abak abb- abba abbb abca abcb abcc abcf abff acaa acab acac acba acca accc accf acfc afaa afak afca afcb afcc affa affc afka akaa akca akka baaa baaf baak baba babb bac- baca bacc back bafc baff bak- baka bbbb bbfc bcaa bcbc bcca bccc bcfc bfca caaa caab caac caaf caba cabf cac- caca cacc cack cafa cafb cafc caff caka cbac cbbc cbca cbcc cbfb cbfc cbka ccaa ccab ccac ccaf ccba ccbc ccca cccb cccc cccf ccfa ccfc ccff cfaa cfab cfac cfbc cfca cfcb cfcf cffb ckac ckbc ckck f--k faaa faac faba faca facc fack fafa fafc faff fcab fcba fcca fccf ffcc ffff fkab kaaa kaab kaaf kaak kaba kabb kabc kabf kacb kacc kafa kafc kaff kaka kakc kakk kbaa kbab kbac kbak kbba kbbb kbbc kbbf kbbk kbca kbcb kbck kbfb kbfc kbff kbfk kbkb kbkf kbkk kcaa kcab kcac kcba kcbc kcbf kcbk kcca kccb kccc kcck kcfa kcfb kcfc kckc kckf kckk kfab kfac kfbc kfbk kfcf kffa kffb kfff kffk kfka kfkb kkaa kkac kkba kkbb kkcb kkck kkkk

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

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

ack-ack bac-cab bakaffa bbbbbbb cabback kacabac

bbbbbbbb

abakabaka baabaabaa

aaaaaaaaaaaaaaa bbbbbbbbbbbbbbb ccccccccccccccc