a-ak a-ok aaaa aaab aaap aaas aaba aabb aabp aaka aaoo aapa aapo aaps aasa aass abaa abab abak abap abas abb- abba abbb abbo abbs aboa abob abok aboo abos abpa abpp abps abs- absa absp abss akaa akao akap akas akka akko akok akos akpo aksa aoba aokp aoks aopo aosp aoss apak apao apap apas apba apbs apo- apoo apop apos appa apps apsa apso apss asaa asab asak asao asap asas asba asbo aska asko asks asob asok asop asos aspa aspo asps assa assk asso assp asss baaa baak baas baba babb babo babs bak- baka bako baks baos bapa bapp baps basa bask baso bass bbas bbbb bbbs bksp boab boak boas boba bobb bobo bobs boka boko boks boob book boop boos bopa bopp bops bosa bosk boso boss bpsa bsaa bsap bsas bsos bspp k-os kaaa kaab kaak kaap kaas kaba kabb kabo kaka kakk kako kaks kaoa kaok kaos kap- kapa kapo kapp kaps kas- kasa kasb kask kaso kasp kass kbaa kbab kbak kbap kbas kbba kbbb kbbk kbbo kbbs kbkb kbkk kbko kboa kbob kbok kboo kbos kbpa kbpk kbpo kbps kbsa kbsb kbsk kbso kbss kkaa kkap kkba kkbb kkbo kkbs kkkk kkoa kkob kkoo kkpk kkps kksa kksp kkss koab koak koap koas koba kobb kobk kobo kobs koka kokb kokk koko kokp koks koob kook kooo koop koos kopa kopb kopp kops kos- kosa kosb koso kosp koss kpak kpao kpas kpba kpbb kpbs kpkk kpoa kpob kpok kpoo kpop kppk kppo kppp kpso kpsp ksab ksak ksas ksba ksbp ksbs kska kskb kskk ksko ksks ksob ksok ksoo ksop ksos kspa kspb kspk kspo ksps kssa ksso ksss oaks oaps oass obak obas obba obbo obkb obok obos obss okak okap okas okka okko okok okpo oksa okso ooaa ooak ooba oooo ooos oops oosa opap opo- opos oppa oppo opps opsa osak osap osas osba osbp osoo osos ossa ossb osso paak paap paas paba paka pako paks paos papa papb papp paps pasa pask paso pasp pass pbpa pbpk pbsa pbsp poak poas poba pobo pobs poka poko pook poop poos pop- popa popo popp pops posa posb posk poso poss ppap ppoa ppos pppa pppo pppp ppps ppss psap psas psoa psos pspp psps pssa psso s-os saab saak saap saas saba sabb sabo sabs saka sakb sakk sako saks saos sapa sapo sapp saps sasa sask saso sass sbaa sbas sbbs sbsa sbsp skab skap skop skpo skss soak soap soas soba sobo sobp sobs soka sokk soko sook soop soos sopa sopo sopp sops sosa soso soss sp-a spak spap spas spok spoo spop spos spps spsa spso spsp spss ssaa ssab ssao ssap ssas ssop sspa sspo ssps sssa sssb ssss