-er a-a a-b aaa aab aae aam aap aar ab- aba abb abe abm abp abr aea aeb aee aem aep aer ama amb ame amm amp amr ap- apa apb ape apm app apr ar- ara arb are arm arp arr b-p baa bab bae bam bap bar bba bbb bbe bbm bbp bbr be- bea beb bee bem bep ber bma bmb bme bmm bmp bmr bpa bpb bpe bpm bpp bpr bra brb bre brm brp brr eaa eab eae eam eap ear eba ebb ebe ebm ebp ebr eea eeb eee eem eep eer em- ema emb eme emm emp emr ep- epa epb epe epm epp epr era erb ere erm erp err m-r maa mab mae mam map mar mba mbb mbe mbm mbp mbr mea meb mee mem mep mer mma mmb mme mmm mmp mmr mpa mpb mpe mpm mpp mpr mra mrb mre mrm mrp mrr p-p paa pab pae pam pap par pba pbb pbe pbm pbp pbr pea peb pee pem pep per pma pmb pme pmm pmp pmr ppa ppb ppe ppm ppp ppr pra prb pre prm prp prr ra- raa rab rae ram rap rar rba rbb rbe rbm rbp rbr re- rea reb ree rem rep rer rma rmb rme rmm rmp rmr rpa rpb rpe rpm rpp rpr rra rrb rrm rrp rrr