a-wa aaaa aaab aaar aaba aabb aabw aaoo aaow aara aaro aaww abaa abab abar abaw abax abb- abba abbb abbo abbr aboa abob aboo abor abow abox abra abro abwa abwr aoba aora aorb arab arar araw arax arba aroa arob aroo aror arow arr- arra arro arrr arwa awar awoo awow awro awwa axar axo- axoa axxo ba-x baaa baar baba babb babo babr bar- bara barb baro barr barx baw- bbbb bbox bbwr boab boar boba bobb bobo bobw boob boor boow boox bor- bora boro borr borw bowa bowr boxa brab brao braw brax broa brob broo bror brow brox brrr bwaa oara obba obbo obor obox obra obro ooaa ooba oooo oora orab orao orar orba orbb orbo oro- oror orra orro orwa orwo owar owow owwa oxa- oxo- oxox oxxo raab raba rabb rabo raob rara rarb raro rawa rawr raww raxa rbbb rbbr roab roar rob- roba robb robo roob roor roox rora roro rowa rowb rowr roww roxa roxo rrrr waaa waao waar waaw waax waba wabb wabo wabr wabw wabx waob waoo waor waow waox war- wara warb waro warr warw warx wawa wawb wawo waxb waxo waxx wbaa wbab wbar wbax wbbb wbbo wbbr wbbw wbbx wbob wbor wbow wbox wbrb wbrr wbrw wbrx wbwb wbwo wbwx wbxb wbxr wbxx woaa woab woar woba wobb wobo wobx woob woow wora worb woro worr worw worx wowb wowo woww woxo woxr woxx wraa wrab wrao wrar wraw wrax wrba wrbb wrbo wrbw wrbx wroa wrob wroo wrow wrox wrra wrrb wrro wrrw wrrx wrwa wrwb wrwr wrxb wrxo wrxw wrxx wwab wwax wwba wwbb wwbr wwor wwow wwox wwra wwrb wwrr wwrw wwrx wwwa wwwr wwww wwwx wxab wxba wxbb wxbw wxbx wxow wxox wxra wxrb wxro wxrr wxrx wxxb wxxx xaar xara xbar xbow xbox xbra xoro xowa xoxo xwax xxxo xxxx