bbbb bbbs bffs bfgf bfsi bfts bftt bggs bgst bibb bibi bibs biff bifi bigb bigg bigs bigt bigu biis bis- biss bist bisu bits bitt bitu bsff bsfs bsgs bsts btss bttb btus bubb bubi bubs bubu buff bugg bugi bugs buif buis buit buiu busi buss bust busu but- buti buts butt buus fbis fbus ffff ffii ffss fftf fgts fibs fiff fifi fift figg figs fiii fisi fiss fist fisu fiti fits fitt fsfi fsgs fssf ftii ftub fubb fubs fubu fuff fufu fugi fugs fugu fuig fuit fusi fuss fust fusu futi futs futu gbbs ggbt ggfg gggg ggss gibb gibs giff gifs gift gifu gigg gigi gigs giis giss gist gits gius gsif gsis gubb gubi gubs gubu guff gugb gugg gugi gugu guib guis gusb guss gust guti guts gutt gutu guus ibfi ibis ibsf ibss ibtb ibts ibus ifbb ifis ifit ifsb iggs igis igus iiii iiis iiit iisi iist iisu iitt isbt isis isit issf issi isss issu isti ists isus itbs itgs itif itis itsf itsi itsu ittf iugs iuiu iuss iust s-ib s-ii sbbs sbig sbsi sbst sbus sfss sfsu sfts sggg sggs sgss sgts sibi sibs sibu siff sift sifu sigg sigi sigs siit sisi siss sist sisu sit- siti sits sitt situ siui sius siut ssgs ssgt ssis ssit sssb sssf sssi ssss sstb ssts stbs stfu stib stif stig stis stit stsf stsi stss stub stuf stug stus stut sub- subb subg subi subs suf- suff sufi sufs sufu sug- sugg sugi suig suis suit sus- susi suss sust susu suti sutu suus tbbs tbgs tbit tbst tfsi tfss tgif tgts tibi tibs tibu tiff tift tigi tigs tiit tiiu tisb tisi tiss tist titi tits titt titu tsgt tsig tsis tssf tssg tssi tsst tsts tsui ttbb ttff ttss tttt tubb tubs tubu tuff tufi tuft tufu tugg tugs tugu tuig tuis tuit tuiu tusi tuss tust tuti tuts tutt tutu ubbi ubii ubis ubit ubtf uggs uggt ugis uguu uist uits usbs usfi usfs usif usis ussb ussf usss usst ussu ustb usti usts usui usus utis utti uttu utug uusi uutf uuuu