a-ak aaaa aaab aaac aaal aaap aaba aabb aabc aabl aabp aaca aacb aacc aack aacl aacp aaka aala aalc aall aapa aapc aapl abaa abab abac abak abal abap abb- abba abbb abca abcb abcc abcl abcp abla abpa abpc abpp acaa acab acac acap acba acbl acca accc accp acla aclc acpa akaa akal akap akca akka al-p alaa alac alak alal alap alb- alba albc alca alcc alk- alka alkb all- alla alll alpa alpl apac apak apal apap apba apca apcb apcc apl- apla aplp appa appc appl baaa baak baal baba babb bac- baca bacc back bak- baka bakl bala balc balk ball bapa bapc bapp bbbb bblb bcaa bcap bcbc bcbp bcca bccc bccl bcpl bcpp blaa blab blac blak blkb bpcp caaa caab caac caal caap caba cac- caca cacc cack caka cala calc calk call calp capa capb capc capp cbac cbal cbbc cbca cbcc cbcl cbcp cbka cbkl cblb cblc cbpc cbpp ccaa ccab ccac ccap ccba ccbc ccca cccb cccc cccl cccp ccla cclc ccpa ccpl ccpp ckac ckbc ckck ckcl ckpc clab clap clpb clpp cpaa cpac cpap cpbc cpca cplc cppa kaaa kaab kaak kaal kaap kaba kabb kabc kacb kacc kacl kacp kaka kakc kakk kala kalb kalc kalk kall kalp kap- kapa kapc kapl kapp kbaa kbab kbac kbak kbal kbap kbba kbbb kbbc kbbk kbbl kbca kbcb kbck kbcl kbkb kbkk kbkl kbla kblb kbll kblp kbpa kbpc kbpk kcaa kcab kcac kcal kcap kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kckc kckk kckl kcla kclc kclk kcll kcpa kcpc kcpl kkaa kkac kkal kkap kkba kkbb kkbl kkcb kkck kkcl kkkk kklb kklc kkll kkpc kkpk kkpl klaa klab klac klak klal klap klbb klbc klbl klca klcb klcc klck klcl klka klkc klkk klkl klla kllb kllc kllk kllp klpc kpac kpak kpal kpba kpbb kpbl kpcc kpcl kpkk kpkl kpla kplc kplk kppc kppk kppl kppp laaa laac laak laal laap laba laca lacc lack lacl lacp laka lala lall lapa lapb lapc lapp lbcc lcac lcbc lcca lccc lcpa lcpc lcpl lkab lkal llcc lllc llll lpac lpla lppl paak paal paap paba paca pack paka pala palk pall palp papa papb papp pbac pbcc pbpa pbpk pcaa pcap pcba pcbc pcca pccc pccl pclk pcll pcpb pcpp plaa plab plac plak plap plcc plkk plpa plpp ppac ppal ppap ppcc pppa pppp