bbb bbm bbo bbr bbs bby bmb bmm bmo bmr bms bob bom boo bor bos boy brb brm bro brr brs bry bsb bsm bso bsr bss bsy by- bym byo byr bys m-o m-r mbb mbm mbo mbr mbs mmb mmm mmo mmr mms mob mom moo mor mos moy mrb mrm mro mrr mrs mry msb msm mso msr mss msy my- myb mym myo myr mys ob- obb obm obo obr obs oby om- omb omm omo omr oms omy oo- oob oom ooo oor oos or- orb orm oro orr ors ory os- osb osm oso osr oss oyo oys rbb rbm rbo rbr rbs rmb rmm rmo rmr rms rob rom roo ror ros roy rrb rrm rrr rrs rsb rsm rso rsr rss ry- rym ryo ryr rys ryy sbb sbm sbo sbr sbs sby smb smm smo smr sms smy sob som soo sor sos soy sr- srb srm sro srr srs sry ss- ssb ssm sso ssr sss sy- syb sym syr sys ybm ybr ybs yby ymm ymo yms yob yom yoo yor yos yoy yro yrs ysb ysm yso ysr yss ysy yyb yys yyy