bbbb bbbs bggs bgst bibb bibi bibo bibs bigb bigg bigo bigs bigt biis bio- biog bioi bios biot bis- biso biss bist bito bits bitt bobb bobi bobo bobs bogg bogi bogo bogs bogt boi- boii bois boit boob boog boos boot bosi boso boss bost botb boti boto bots bott bsgs bsos bsts btob btss bttb gbbo gbbs ggbt gggg ggss gibb gibs gigg gigi gigo gigs giis giog gioi giss gist gito gits gobi gobo gobs gogi gogo gogs gois goit goog gooi goos goot gosi goso goss gost goti goto gots gott gsis gsos gtos i-go ibis ibos ibot ibss ibtb ibts igbo iggs igis igoo igot igso iiii iiio iiis iiit iioi iioo iios iisi iist iitt iobi iogt ioii ioio ioit iooi iooo ioos ioso ioto isbt isis isit iso- isos issi isso isss isti isto ists itbs itgo itgs itis itoi itoo itos itsi itso itto obbo obis obit oboi obos obot obss obst obts ogb oggi ogog ogoi ogsi oigo oiii oios oist oiti oobi oooo ooos oosi oost ootb oots osgi osii osis osoi osoo osos ossb ossi osso osti osts otbs otis otit oto- otog otoo otos otsg otso otti otto otts s-ib s-ii s-os sbbs sbig sbot sbsi sbst sggg sggs sgio sgss sgts sibi sibo sibs sigg sigi sigo sigs siit sios siot sisi siss sist sit- siti sito sits sitt sobo sobs sobt sogi sogo sogs sois soit soog soos soot sosi soso soss sost soto sots ssgs ssgt ssis ssit ssot sssb sssi ssss sstb ssts stbs stib stig stio stis stit stob stog stoo stos stot stsi stss tbbs tbgs tbit tbst tgts tibi tibs tigi tigs tiit tios tisb tisi tiso tiss tist titi tito tits titt tobi tobo tobs tobt togo togs togt tois toit toos toot tosb tosi toso toss tost toti toto tots tott tsgt tsig tsis tsob tsoi tsos tssg tssi tsst tsts ttbb ttss tttt