a-ak a-ok aaaa aaab aaar aaba aabb aaka aaoo aara aaro abaa abab abag abak abar abb- abba abbb abbo abbr aboa abob abok aboo abor abra abro ag-o agag agao agar agba agbo agga agob agog agoo agra agro akaa akao akar akka akko akok akr- akra aoba aora aorb arab arag arak arar arba arga argb argo arka arko aroa arob aroo aror arr- arra arrg arrk arro arrr baaa baak baar baba babb babo babr baga bagg bago bak- baka bako bakr bar- bara barb barg bark baro barr bbbb bbga bbrg boab boag boak boar boba bobb bobo boga bogg bogo boka boko boob boog book boor bor- bora borg bork boro borr brab brag brak brao brka brkb broa brob brog brok broo bror brrr gaar gaba gabb gabo gabr gaga gagg gago gara garb garg garo garr gbag gbbo gggg goar goba gobo goga gogo goog gook goor gora gorb gorg goro gorr grab grbr grob grog grok groo gror grrr kaaa kaab kaag kaak kaar kaba kabb kabg kabo kabr kag- kaga kagb kagg kago kagr kaka kakk kako kaoa kaog kaok kaor kara karb karg kark karo karr kbaa kbab kbak kbar kbba kbbb kbbg kbbk kbbo kbbr kbga kbgb kbgg kbgo kbgr kbkb kbkg kbkk kbko kbkr kboa kbob kbok kboo kbra kbrb kbrg kbrk kbro kgab kgak kgba kgbb kgbr kgga kggg kggo kggr kgor kgra kgrb kgrg kgrk kgro kgrr kkaa kkag kkar kkba kkbb kkbg kkbo kkbr kkgb kkgo kkgr kkkk kkoa kkob kkoo kkor kkrb kkrk kkro kkrr koab koak koar koba kobb kobk kobo kobr koga kogb kogg kogo koka kokb kokk koko kokr koob koog kook kooo koor kora korb korg kork koro korr krab krag krak krar krba krbb krbg krbk krbr krka krkk krko krkr kroa krob krog krok kroo kror krrb krrg krrk krro krrr oara obak obba obbo obkb obok obor obra obro ogar ogb ogba ogoa ogog ogra ogro okak okgo okka okko okok okor okra okro ooaa ooak ooba oooo oora orab orak orao orar orba orbb orbo orga orgo orka orko oro- orok oror orra orro raab raag raak raba rabb rabk rabo raga ragg rago raka rakk raob raok rara rarb rark raro rbbb rbbr rgba roab roag roak roar rob- roba robb robo roga rogg rogo roka rokk roko rokr roob roog rook roor rora rork roro rrrr