a-ak a-ok aaaa aaab aaar aaba aabb aaka aaoo aara aaro abaa abab abak abar abb- abba abbb abbo abbr aboa abob abok aboo abor abra abro abza akaa akao akar akka akko akok akr- akra aoba aora aorb arab arak arar arba arka arko aroa arob aroo aror aroz arr- arra arrk arro arrr arza arzo aza- azab azar azaz azo- azoo azor azra azza azzo baaa baak baar baaz baba babb babo babr bak- baka bako bakr bar- bara barb bark baro barr barz baza bazo bbbb boab boak boar boaz boba bobb bobo boka boko boob book boor booz bor- bora bork boro borr borz boza bozo brab brak brao braz brka brkb broa brob brok broo bror broz brrr brza bzrk bzzz kaaa kaab kaak kaar kaba kabb kabo kabr kabz kaka kakk kako kaoa kaok kaor kara karb kark karo karr karz kaza kazo kazr kazz kbaa kbab kbak kbar kbaz kbba kbbb kbbk kbbo kbbr kbbz kbkb kbkk kbko kbkr kbkz kboa kbob kbok kboo kboz kbra kbrb kbrk kbro kbrz kbzo kbzz kkaa kkar kkba kkbb kkbo kkbr kkbz kkkk kkoa kkob kkoo kkor kkoz kkrb kkrk kkro kkrr kkrz kkzz koab koak koar koaz koba kobb kobk kobo kobr koka kokb kokk koko kokr kokz koob kook kooo koor kooz kora korb kork koro korr koza kozb kozk kozo kozr krab krak krar kraz krba krbb krbk krbr krbz krka krkk krko krkr krkz kroa krob krok kroo kror kroz krrb krrk krro krrr krrz krza krzk krzr krzz kzar kzaz kzbb kzbk kzbr kzbz kzkr kzkz kzoo kzor kzoz kzrb kzrk kzro kzrr kzrz kzza kzzb kzzk kzzo kzzr kzzz oara obak obba obbo obkb obok obor obra obro okak okaz okka okko okok okor okra okro ooaa ooak ooba oooo oora orab orak orao orar orba orbb orbo orka orko oro- orok oror oroz orra orro orzk orzo ozar raab raak raaz raba rabb rabk rabo raka rakk raob raok rara rarb rark raro rarz raza razo razr razz rbbb rbbr roab roak roar rob- roba robb robo roka rokk roko rokr roob rook roor rooz rora rork roro roza rozz rrrr rzab rzka z-ro zaar zaba zabo zabr zaka zakk zara zarb zark zaro zarr zaza zbar zoar zobo zoo- zook zora zorb zork zoro zoza zozo zzzz