-er b-p bbb bbe bbm bbn bbo bbp bbr bbt be- beb bee bem ben beo bep ber bet bmb bme bmm bmn bmo bmp bmr bmt bnb bne bnn bno bnp bnr bnt bob boe bom bon boo bop bor bot bpb bpe bpm bpn bpo bpp bpr bpt brb bre brm brn bro brp brr brt btb bte btm btn bto btp btr btt ebb ebe ebm ebn ebo ebp ebr ebt eeb eee eem een eeo eep eer eet em- emb eme emm emn emo emp emr emt en- enb ene enm enn eno enp enr ent eo- eob eoe eom eon eoo eop eor eot ep- epb epe epm epn epo epp epr ept erb ere erm ern ero erp err ert etb ete etm etn eto etp etr ett m-o m-r mbb mbe mbm mbo mbp mbr mbt meb mee mem men meo mep mer met mmb mme mmm mmn mmo mmp mmr mmt mnb mne mnm mnn mno mnp mnr mnt mob moe mom mon moo mop mor mot mpb mpe mpm mpn mpo mpp mpr mpt mrb mre mrm mrn mro mrp mrr mrt mtb mte mtm mtn mto mtp mtr mtt nbb nbe nbm nbn nbo nbp nbr nbt ne- neb nee nem nen neo nep ner net nmb nme nmm nmn nmo nmp nmr nmt nnb nne nnm nnn nno nnp nnt no- nob noe nom non noo nop nor not npb npe npm npn npo npp npr npt nrb nre nrm nrn nro nrp nrr nrt ntb nte ntm ntn nto ntp ntr ntt ob- obb obe obm obn obo obp obr obt oeb oee oem oen oeo oep oer oet om- omb ome omm omn omo omp omr omt on- onb one onn ono onp onr ont oo- oob oom oon ooo oop oor oot op- opb ope opm opn opo opp opr opt or- orb ore orm orn oro orp orr ort ot- otb ote otm otn oto otp otr ott p-p pbb pbe pbm pbn pbo pbp pbr pbt peb pee pem pen peo pep per pet pmb pme pmm pmn pmo pmp pmr pmt pn- pnb pne pnm pnn pno pnp pnr pnt pob poe pom pon poo pop por pot ppb ppe ppm ppn ppo ppp ppr ppt prb pre prm prn pro prp prr prt pt- ptb pte ptm ptn pto ptp ptr ptt rbb rbe rbm rbn rbo rbp rbr rbt re- reb ree rem ren reo rep rer ret rmb rme rmm rmn rmo rmp rmr rmt rnb rnm rnn rno rnp rnr rnt rob roe rom ron roo rop ror rot rpb rpe rpm rpn rpo rpp rpr rpt rrb rrm rrn rrp rrr rrt rtb rte rtm rtn rto rtp rtr rtt tbb tbe tbm tbn tbo tbp tbr tbt te- teb tee tem ten teo tep ter tet tmb tme tmm tmn tmo tmp tmr tmt tnb tne tnm tnn tno tnp tnr tnt to- tob toe tom ton too top tor tot tpb tpe tpm tpn tpo tpp tpr tpt trb tre trm trn tro trp trr trt ttb tte ttm ttn tto ttp ttr ttt