b-u bbb bbi bbm bbs bbu bby bi- bib bii bim bis biu biy bmb bmi bmm bms bmu bsb bsi bsm bss bsu bsy bub bui bum bus buu buy by- byi bym bys byu ibb ibi ibm ibs ibu iby iib iii iim iis iiu im- imb imi imm ims imu imy is- isb isi ism iss isu isy iu- iub iui ium ius iym iys iyy mbb mbi mbm mbs mbu mi- mib mii mim mis miu miy mmb mmi mmm mms mmu msb msi msm mss msu msy mub mui mum mus muu muy my- myb mym mys myu sbb sbi sbm sbs sbu sby sib sii sim sis siu smb smi smm sms smu smy ss- ssb ssi ssm sss ssu sub sui sum sus suu suy sy- syb syi sym sys syu ubb ubi ubs ubu uby uib uii uim uis uiu um- umb umi umm ums umu usb usi usm uss usu uum uus uuu uyi uys uyu ybi ybm ybs yby yii yim yis ymi ymm yms ysb ysi ysm yss ysu ysy yui yum yus yuu yuy yyb yys yyu yyy