-er -ey bbb bbe bbm bbo bbr bby be- beb bee bem beo ber bey bmb bme bmm bmo bmr bob boe bom boo bor boy brb bre brm bro brr bry by- bye bym byo byr ebb ebe ebm ebo ebr eby eeb eee eem eeo eer eey em- emb eme emm emo emr eo- eob eoe eom eoo eor erb ere erm ero err ery eye eym eyo eyr m-o m-r mbb mbe mbm mbo mbr meb mee mem meo mer mey mmb mme mmm mmo mmr mob moe mom moo mor moy mrb mre mrm mro mrr mry my- myb mye mym myo myr ob- obb obe obm obo obr oby oeb oee oem oeo oer oey om- omb ome omm omo omr omy oo- oob oom ooo oor or- orb ore orm oro orr ory oye oyo rbb rbe rbm rbo rbr re- reb ree rem reo rer rey rmb rme rmm rmo rmr rob roe rom roo ror roy rrb rrm rrr ry- rye rym ryo ryr ryy ybe ybm ybr yby yeb yee yem yeo yer yey yme ymm ymo yob yoe yom yoo yor yoy yre yro yyb yye yyy