-er a-a a-b aaa aab aae aam aan aap aar ab- aba abb abe abm abn abp abr aea aeb aee aem aen aep aer ama amb ame amm amn amp amr an- ana anb ane anm ann anp anr ap- apa apb ape apm apn app apr ar- ara arb are arm arn arp arr b-p baa bab bae bam ban bap bar bba bbb bbe bbm bbn bbp bbr be- bea beb bee bem ben bep ber bma bmb bme bmm bmn bmp bmr bna bnb bne bnn bnp bnr bpa bpb bpe bpm bpn bpp bpr bra brb bre brm brn brp brr eaa eab eae eam ean eap ear eba ebb ebe ebm ebn ebp ebr eea eeb eee eem een eep eer em- ema emb eme emm emn emp emr en- ena enb ene enm enn enp enr ep- epa epb epe epm epn epp epr era erb ere erm ern erp err m-r maa mab mae mam man map mar mba mbb mbe mbm mbp mbr mea meb mee mem men mep mer mma mmb mme mmm mmn mmp mmr mna mnb mne mnm mnn mnp mnr mpa mpb mpe mpm mpn mpp mpr mra mrb mre mrm mrn mrp mrr naa nab nae nam nan nap nar nba nbb nbe nbm nbn nbp nbr ne- nea neb nee nem nen nep ner nma nmb nme nmm nmn nmp nmr nna nnb nne nnm nnn nnp npa npb npe npm npn npp npr nra nrb nre nrm nrn nrp nrr p-p paa pab pae pam pan pap par pba pbb pbe pbm pbn pbp pbr pea peb pee pem pen pep per pma pmb pme pmm pmn pmp pmr pn- pna pnb pne pnm pnn pnp pnr ppa ppb ppe ppm ppn ppp ppr pra prb pre prm prn prp prr ra- raa rab rae ram ran rap rar rba rbb rbe rbm rbn rbp rbr re- rea reb ree rem ren rep rer rma rmb rme rmm rmn rmp rmr rna rnb rnm rnn rnp rnr rpa rpb rpe rpm rpn rpp rpr rra rrb rrm rrn rrp rrr