bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins bint biny birb biri birn birr birs birt biry bis- biss bist bisy bits bitt biys bnib bnin bnrr bnss brin bris brit brns brrr brrs brsb brsr brst bry- bryn bsin bsns bsts btrt btry btss bttb byit byrn byrt bysb bysi byss byst bysy byts i-by ibis ibns ibri ibsn ibss ibtb ibts ibyi iiii iiis iiit iirs iisi iisr iist iitr iitt inby inis init inni innr inns inny inri inrs inss inst inti intn intr ints irby iri- irin iris iriy irri irrs irti irts iryn isbn isbt isin isis isit isnt isri issi issr isss issy isti istr ists isty isys itbs itby itin itis itri itrs itry itsi itsy itty n-ii nbti nbty nibi nibs niir niit nini nins nirs nirt nisi niss nist nitb niti nitr nits nity niyi nnit nnnn nnss nntn nrts nsin nsis nsnr nssb nssr nsss nsts ntis ntsb ntss nttr nyit nynt nyny nyrb nyss nyst nytb rbbb rbbr rbbs rbis rbss rbst rib- ribs riby riin riis rinn riny riri rirs risi riss rist riti rits ritt rnbr rnin rnnt rrrr rsbi rsis rsnn rsnr rsts rtns rtss rtts ryis rynn rynt rysy rytt ryyt s-ib s-ii sbbs sbsi sbst sbtn sibi sibs siby siit sini sinn sins sint siny siri sirr sirs sirt sisi siss sist sisy sit- siti sitn sits sitt sity siyi snib snir snit snns snrs snsy sntr snys srby srib sris srni srnn srtr ssbn ssbr ssby ssin ssis ssit ssns ssri ssrs sssb sssi ssss sstb ssts stbs stib stir stis stit stnn stnr stns stri strn strs stry stsi stss sttr styr stys syis syn- syns syny syrs syrt syry syss syst sytt tbbs tbit tbrb tbst tibi tibs tiit tini tinn tins tint tiny tirb tiri tirr tirs tiry tisb tisi tiss tist titi tits titt tiyi tiyn tnts tri- trib trin tris trit trsi trst trtr try- tryb trys tsin tsis tssi tssr tsst tsts tsys ttbb ttss tttt ttys tybi tyin tyir tynt tyny tyr- tyrr tyss tyst tyti tytt tyty tyyn ybbs ybry yins yirb yirn yirr yiss yist yiti yrin yryn ysby ysii ysyb yyyy