-er bbb bbe bbm bbn bbo bbr be- beb bee bem ben beo ber bmb bme bmm bmn bmo bmr bnb bne bnn bno bnr bob boe bom bon boo bor brb bre brm brn bro brr ebb ebe ebm ebn ebo ebr eeb eee eem een eeo eer em- emb eme emm emn emo emr en- enb ene enm enn eno enr eo- eob eoe eom eon eoo eor erb ere erm ern ero err m-o m-r mbb mbe mbm mbo mbr meb mee mem men meo mer mmb mme mmm mmn mmo mmr mnb mne mnm mnn mno mnr mob moe mom mon moo mor mrb mre mrm mrn mro mrr nbb nbe nbm nbn nbo nbr ne- neb nee nem nen neo ner nmb nme nmm nmn nmo nmr nnb nne nnm nnn nno no- nob noe nom non noo nor nrb nre nrm nrn nro nrr ob- obb obe obm obn obo obr oeb oee oem oen oeo oer om- omb ome omm omn omo omr on- onb one onn ono onr oo- oob oom oon ooo oor or- orb ore orm orn oro orr rbb rbe rbm rbn rbo rbr re- reb ree rem ren reo rer rmb rme rmm rmn rmo rmr rnb rnm rnn rno rnr rob roe rom ron roo ror rrb rrm rrn rrr