bbbb bibb bibi bibo bio- bioi biot bito bitt biw- bobb bobi bobo bobw boi- boii boit boob boot boow botb boti boto bott botw bowi bowt btob bttb btwo ibot ibtb iiii iiio iiit iioi iioo iitt iiwi iobi ioii ioio ioit iooi iooo ioto itoi itoo itto iwiw obbo obit oboi obot oiii oiti oobi oooo ootb ootw otit oto- otoo otow otti otto otwo owow owt- owtt tbit tibi tiit titi tito titt tiwi tobi tobo tobt toit toot toti toto tott ttbb tttt twbt twi- twib twit two- twob twoo twot wbbb wbbi wbbo wbbt wbbw wbib wbio wbiw wbob wboi wbow wbti wbto wbtt wbtw wbwb wbwi wbwo wbwt wibb wibi wibt wibw wiii wiit wiob wioi wioo wiot witi witt wiwi wobb wobo wobt woio woob woot woow wotb wott wotw wowb wowi wowo wowt woww wtbb wtbi wtbo wtib wtob wtot wtow wttb wtti wtto wttt wttw wtwb wtwo wtwt wtww wwbb wwbt wwib wwii wwio wwot wwow wwti wwtw wwwi wwww