bbbb bbbs bggs bgst bibb bibi bibs bigb bigg bigs bigt bigu biis bis- biss bist bisu bits bitt bitu bsgs bsts btss bttb btus bubb bubi bubs bubu bugg bugi bugs buis buit buiu busi buss bust busu but- buti buts butt buus gbbs ggbt gggg ggss gibb gibs gigg gigi gigs giis giss gist gits gius gsis gubb gubi gubs gubu gugb gugg gugi gugu guib guis gusb guss gust guti guts gutt gutu guus ibis ibss ibtb ibts ibus iggs igis igus iiii iiis iiit iisi iist iisu iitt isbt isis isit issi isss issu isti ists isus itbs itgs itis itsi itsu iugs iuiu iuss iust s-ib s-ii sbbs sbig sbsi sbst sbus sggg sggs sgss sgts sibi sibs sibu sigg sigi sigs siit sisi siss sist sisu sit- siti sits sitt situ siui sius siut ssgs ssgt ssis ssit sssb sssi ssss sstb ssts stbs stib stig stis stit stsi stss stub stug stus stut sub- subb subg subi subs sug- sugg sugi suig suis suit sus- susi suss sust susu suti sutu suus tbbs tbgs tbit tbst tgts tibi tibs tibu tigi tigs tiit tiiu tisb tisi tiss tist titi tits titt titu tsgt tsig tsis tssg tssi tsst tsts tsui ttbb ttss tttt tubb tubs tubu tugg tugs tugu tuig tuis tuit tuiu tusi tuss tust tuti tuts tutt tutu ubbi ubii ubis ubit uggs uggt ugis uguu uist uits usbs usis ussb usss usst ussu ustb usti usts usui usus utis utti uttu utug uusi uuuu