a-ak a-be a-ok aaaa aaab aaae aaap aaba aabb aabp aaea aaep aaka aake aaoe aaoo aapa aapo abaa abab abae abak abap abb- abba abbb abbe abbo abee aboa abob abok aboo abpa abpp aeap aeka akaa akae akao akap akee akka akko akok akpo aoba aokp aopo apak apao apap apba apea apep apke apo- apoe apoo apop appa baaa baak baba babb babe babo baek bak- baka bake bako bapa bape bapp bbbb bbeb beak beap beba bebb bebe bebo beeb beek beep beka beke beko beo- beok bepo boab boak boba bobb bobe bobo boea boee boeo boep boka boke boko boob booe book boop bopa bope bopp bpea bpoe eaba eaop eapp ebba ebbo eboe eboo ebpo eeea eeee eeka eeke eka- ekab ekeb ekek ekka ekoa ekpe ekpo eoka epaa epee eppa eppo eppp kaaa kaab kaak kaap kaba kabb kabe kabo kaeo kaep kaka kake kakk kako kaoa kaok kap- kapa kape kapo kapp kbaa kbab kbae kbak kbap kbba kbbb kbbe kbbk kbbo kbeb kbee kbek kbeo kbkb kbkk kbko kboa kbob kboe kbok kboo kbpa kbpe kbpk kbpo kea- keak keap keba kebb kebe keek keep keka kekb keke keko keok kep- kepa kepe kkaa kkap kkba kkbb kkbe kkbo kkea kkkk kkoa kkob kkoo kkpk koab koae koak koap koba kobb kobe kobk kobo koea koka kokb koke kokk koko kokp koob kook kooo koop kopa kopb kope kopp kpae kpak kpao kpba kpbb kpbe kpek kpke kpkk kpoa kpob kpoe kpok kpoo kpop kppk kppo kppp o-eo oake obak obba obbo obea obkb oboe obok oepa okak okap okka okko okok okpe okpo ooaa ooak ooba oobe oooo opap opep opo- oppa oppo paak paap paba paea paep paka pake pako papa papb pape papp pbpa pbpk peab peak peap peba peek peep peka peke pekk peko pepa pepe pepo poak poba pobo poea poka poke poko pook poop pop- popa pope popo popp ppap ppoa pppa pppo pppp