-er bbb bbe bbm bbn bbo bbr be- beb bee bem ben beo ber bez bmb bme bmm bmn bmo bmr bmz bnb bne bnn bno bnr bnz bob boe bom bon boo bor boz brb bre brm brn bro brr brz bze bzn bzo bzr bzz 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 enz eo- eob eoe eom eon eoo eor erb ere erm ern ero err erz eze ezo ezr ezz m-o m-r mbb mbe mbm mbo mbr meb mee mem men meo mer mez mmb mme mmm mmn mmo mmr mmz mnb mne mnm mnn mno mnr mnz mob moe mom mon moo mor moz mrb mre mrm mrn mro mrr mrz mzb mzm mzn nbb nbe nbm nbn nbo nbr ne- neb nee nem nen neo ner nez nmb nme nmm nmn nmo nmr nmz nnb nne nnm nnn nno nnz no- nob noe nom non noo nor noz nrb nre nrm nrn nro nrr nrz nzb nze nzo nzz ob- obb obe obm obn obo obr oeb oee oem oen oeo oer om- omb ome omm omn omo omr omz on- onb one onn ono onr oo- oob oom oon ooo oor or- orb ore orm orn oro orr orz oze ozm ozo ozz rbb rbe rbm rbn rbo rbr re- reb ree rem ren reo rer rez rmb rme rmm rmn rmo rmr rnb rnm rnn rno rnr rnz rob roe rom ron roo ror roz rrb rrm rrn rrr rzb rze rzm rzo zbb zbm zbr zeb zee zem zen zeo zer zez zmb zmm zne znn zno zo- zob zoe zom zon zoo zor zro zzr zzz