bbbb bbbs bblb bbls bffl bffs bfsi bibb bibi bibl bibs biff bifi biis bili bill bils bilu bily bis- bisl biss bisu bisy biys blis blls blss blub bluf blus bly- blys bsff bsfs bubb bubi bubs bubu buff buif buis buiu bulb buli bull buls bulu busi buss busu busy buus buyi buyl buys buyu byil bysb bysi bysl byss bysy byul fbis fbus ffff ffii ffss fibs fiff fifi fiii fiil fili fill fils fisi fiss fisu flii flis flub fluf flus fluy flyi flys fsfi fssf fubb fubs fubu fuff fufu fuil fuli full fuls fulu fusi fuss fusu fuyl fuyu fyfi fyli i-by ibfi ibis ibly ibsf ibss ibus ibuy ibyi ifbb ifby iffy ifil ifis ifsb iiii iiis iisi iisu ilis ill- illi ills illy ilus iluy isbl isil isis isls isly issf issi isss issu issy isus isyl isys iuiu iuss libs libu liff lifl liii liis lilb lili lill lils lilu lily lisi liss lisu lisy liuf lius liyl liyu llbs llll lsbu lubs luby luff lufu luif luis luli lull lulu lusi luss luyi luys lyff lyfy lyif lyly lys- lysi lysl lyss lyyf s-ib s-ii sbbs sbsi sbus sfls sfss sfsu sibi sibs sibu siby siff sifl sifu sify sil- silf sili sill sils silu sisi siss sisu sisy siui sius siyi siyu sl-i slib slsu slub slys ssby ssfl ssis sssb sssf sssi ssss sub- subb subi subl subs suf- suff sufi sufs sufu suis sul- sulf suli sull sulu sus- susi suss susu susy suus suyi suyu syff syfy syis syl- syli syll syls syss ubbi ubii ubis ubli ubls ubly ulli ully ulul ulus ulys usbl usbs usfi usfl usfs usif usis uslu ussb ussf usss ussu ussy usui usul usus uulu uusi uuuu ybbs yiff yili yill yiss ylli ylls ysby ysii yssu ysyb yubu yuff yufu yuli yuls yulu yuyu yyff yyyy