bbbb bbbs bblb bbls bffl bffs bfsi bibb bibi bibl bibs biff bifi biis bili bill bils bily bis- bisl biss bisy biys blis blls blss bly- blys bsff bsfs byil bysb bysi bysl byss bysy fbis ffff ffii ffss fibs fiff fifi fiii fiil fili fill fils fisi fiss flii flis flyi flys fsfi fssf fyfi fyli i-by ibfi ibis ibly ibsf ibss ibyi ifbb ifby iffy ifil ifis ifsb iiii iiis iisi ilis ill- illi ills illy isbl isil isis isls isly issf issi isss issy isyl isys libs liff lifl liii liis lilb lili lill lils lily lisi liss lisy liyl llbs llll lyff lyfy lyif lyly lys- lysi lysl lyss lyyf s-ib s-ii sbbs sbsi sfls sfss sibi sibs siby siff sifl sify sil- silf sili sill sils sisi siss sisy siyi sl-i slib slys ssby ssfl ssis sssb sssf sssi ssss syff syfy syis syl- syli syll syls syss ybbs yiff yili yill yiss ylli ylls ysby ysii ysyb yyff yyyy