b-u bbb bbo bbr bbs bbu bby bob boo bor bos bou boy boz brb bro brr brs bru bry brz bsb bso bsr bss bsu bsy bub buo bur bus buu buy buz by- byo byr bys byu byz bzo bzr bzs bzu bzz ob- obb obo obr obs obu oby oo- oob ooo oor oos or- orb oro orr ors oru ory orz os- osb oso osr oss osu ou- ouo our ous oyo oys ozo ozs ozu ozz rbb rbo rbr rbs rbu rob roo ror ros rou roy roz rrb rrr rrs rru rsb rso rsr rss rsu rub ruo rur rus ruu ruy ruz ry- ryo ryr rys ryu ryy ryz rzb rzo rzy sbb sbo sbr sbs sbu sby sob soo sor sos sou soy soz sr- srb sro srr srs sry ss- ssb sso ssr sss ssu ssz sub suo sur sus suu suy suz sy- syb syr sys syu szr szu ubb ubo ubr ubs ubu uby uob uoo uor uos ur- urb uro urr urs uru ury urz usb uso usr uss usu usz uur uus uuu uyo uys uyu uzb uzo uzu ybr ybs yby ybz yob yoo yor yos you yoy yro yrs yru ysb yso ysr yss ysu ysy ysz yuo yur yus yuu yuy yyb yys yyu yyy yyz yzb yzr yzu yzy zbb zbr zbs zby zo- zob zoo zor zos zou zro zrs zsu zsz zub zur zus zuz zzr zzs zzy zzz