bbbb bbbs bblb bbls bffl bffs bfsi bfts bftt bibb bibi bibl bibs biff bifi biis bili bill bils bilt bis- bisl biss bist bits bitt blbt blis blit blls blss blst blts bsff bsfs bsts btss bttb fbis ffff ffii ffss fftf fibs fiff fifi fift fiii fiil fili fill fils fisi fiss fist fiti fits fitt flii flis flit flts fsfi fssf ft-l ftii ftlb ibfi ibis ibsf ibss ibtb ibtl ibts ifbb ifil ifis ifit ifsb iiii iiis iiit iisi iist iitt ilis ilit ill- illi ills illt ilts isbl isbt isil isis isit isls issf issi isss isti ists itbs itif itil itis itll itsf itsi ittf lfts libs liff lifl lift liii liis lilb lili lill lils lilt lisi liss list litb liti litl lits litt llbs llll lsts ltbf ltbl ltib ltsi s-ib s-ii sbbs sbsi sbst sfls sfss sfts sibi sibs siff sifl sift siit sil- silf sili sill sils silt sisi siss sist sit- siti sits sitt sl-i slft slib slit slst slts ssfl ssis ssit sslt sssb sssf sssi ssss sstb sstl ssts stbs stib stif stil stis stit stlt stsf stsi stss tbbs tbil tbit tbst tfsi tfss tibi tibs tiff tift tiit till tils tilt tisb tisi tiss tist titi tits titt tlli tsfl tsis tssf tssi tsst tsts ttbb ttff ttss tttt