aaaa aaab aaar aaas aaav aaba aabb aaoo aara aaro aars aasa aass aava abaa abab abar abas abb- abba abbb abbo abbr abbs aboa abob aboo abor abos abov abra abro abrs abs- absa abss abva aoba aora aorb aors aoss arab arar aras arba arbs aroa arob aroo aror aros arr- arra arro arrr arrs ars- arsa arso arva arvo asaa asab asao asar asas asba asbo asob asor asos asra asro asrs assa asso assr asss asva asvs avab avao avar avas avor avos avra avro avva avvo baaa baar baas baba babb babo babr babs baos bar- bara barb baro barr bars basa baso bass bava bbas bbbb bbbs boab boar boas boba bobb bobo bobs boob boor boos bor- bora boro borr bors bosa boso boss bova bovo brab brao bras brav broa brob broo bror bros brrr brrs brsb brsr bsaa bsas bsos bsra oara oars oass oavs obas obba obbo obor obos obra obro obsr obss obvs ooaa ooba oooo ooos oora oosa orab orao orar oras orav orba orbb orbo orbs oro- oror oros orra orro orrs orsa orso orvr orvs osar osas osba osoo osor osos osov osro ossa ossb osso ovar ovo- ovoo ovra raab raas raba rabb rabo rabs raob raos rara rarb raro rars rasa raso rass rava rbbb rbbr rbbs rbss roab roar roas rob- roba robb robo robs roob roor roos rora roro rosa roso ross rova rovo rovs rras rrrr rsaa rsos rssa s-os saab saar saas saba sabb sabo sabr sabs saor saos sara saro sarr sars sarv sasa saso sass sava savo savs sbaa sbar sbas sbbs sbor sbsa soar soas soba sobo sobr sobs soor soos sora sorb soro sorr sors sosa soso soss sosv sova sovo sovs sras sros ssaa ssab ssao ssas ssbr ssra ssrs sssa sssb ssss svar svor vaar vaas vabs vara varr vars vas- vasa vaso vass vava vavs voar voor vor- vora voro vors vosa voso voss vras vrav vrba vrsa vvob vvsb vvvv