a-be a-do aaaa aaab aaad aaae aaaf aaap aaba aabb aabd aabp aada aade aaea aaep aafa aafb aafd aaff aaoe aaoo aapa aapo abaa abab abad abae abaf abap abb- abba abbb abbe abbo abda abdo abed abee abff aboa abob abod abof aboo abpa abpd abpp adaa adab adad adae adao adap adba adda addd adde addo adea adeb adee adeo adfa adob adod adoe adoo adp- aeaf aeap aede afaa afad afao afap afdb afee affa affo afoa afoe afoo afpa afpe aoba aopo apao apap apba apda apdd apea aped apep apfa apfo apo- apod apoe apof apoo apop appa appd baaa baad baaf baba babb babe babo bada badb badd bade bado baed baff bafo bapa bape bapp bbad bbbb bbdd bbdo bbeb bead beaf beap beba bebb bebe bebo beda bede bedo beeb beed beef beep befa befe beff befo beo- beod beof bepo bfpo bfpp boab boad boba bobb bobe bobo boda bodb bode bodo boea boee boef boeo boep bofa bofd bofe boff boob bood booe boof boop bopa bope bopp bpda bpea bpoe d-bo daab daad daae daap daba dabb dabo dabp dada dade dado daeb dafa dafe daff dafo dapa dape dapp dbfo dbpd dbpf dddd ddpo dead deae deaf deap deba debe deda dedd dede dedo deeb deed deef deep defe deff defo deop depa depe depo depp dfaf dffa dfoe doab doae doap doba dobb dobe dod- doda dodd dode dodo doea doff doob dood doof doop dopa dope dopo dopp dpaa dppa eaaf eaba eada eadb eadd eadp eafb eaop eapp ebba ebbo ebed eboe eboo ebpo edad edda edde eddo eddp ede- edea edfa edod eede eeea eeee eefa eefe efab efda efeo effa efpa eode epaa epad epee epfa epod eppa eppo eppp faaa faad faap faba fabd fabe fabo fada fadd fade fado faeb fafa fafe faff fafo fapa fape fapp fbop fdoa fead feaf feap feba febo feda fede feeb feed fefe feff fefo feod feof fepa ffee ffff foad foaf foba foda fode foed fofo food foof fopp fpaa fpda o-eo oade oafo obad obba obbo obea obed oboe odbo odda oddd odea oded odeo odoo odop oedo oepa off- offa offe offo ooaa ooba oobe ooda ooff oooo opap oped opep opo- oppa oppo paap paba pada padd pade pado paea paep pafa pafe paff papa papb pape papp pbed pbpa pdaf pdea pdfa pdpa peab peap peba ped- peda pede pedf pedo peed peep peff pepa pepd pepe pepo pfaa pfff poad poba pobo pod- poda podd pode podo poea poed poff pood poof poop pop- popa pope popo popp ppad ppap ppfa ppoa ppod pppa pppd pppo pppp