-er a-a a-b aaa aab aae aak aam aao aap aar aas ab- aba abb abe abk abm abo abp abr abs aea aeb aee aek aem aeo aep aer aes aka akb ake akk akm ako akp akr aks ama amb ame amk amm amo amp amr ams aoa aob aoe aok aom aoo aop aor aos ap- apa apb ape apk apm apo app apr aps ar- ara arb are ark arm aro arp arr ars as- asa asb ase ask asm aso asp asr ass b-p baa bab bae bak bam bao bap bar bas bba bbb bbe bbk bbm bbo bbp bbr bbs be- bea beb bee bek bem beo bep ber bes bka bkb bke bkk bkm bko bkp bkr bks bma bmb bme bmk bmm bmo bmp bmr bms boa bob boe bok bom boo bop bor bos bpa bpb bpe bpm bpo bpp bpr bps bra brb bre brk brm bro brp brr brs bsa bsb bse bsk bsm bso bsp bsr bss eaa eab eae eak eam eao eap ear eas eba ebb ebe ebk ebm ebo ebp ebr ebs eea eeb eee eek eem eeo eep eer ees eka ekb eke eko ekp ekr eks em- ema emb eme emk emm emo emp emr ems eo- eoa eob eoe eok eom eoo eop eor eos ep- epa epb epe epm epo epp epr eps era erb ere erk erm ero erp err ers es- esa esb ese esk esm eso esp esr ess ka- kaa kab kae kak kam kao kap kar kas kba kbb kbe kbk kbm kbo kbp kbr kbs ke- kea keb kee kek kem keo kep ker kes kkb kke kkk kkm kkp kkr kks kma kmb kme kmk kmm kmo kmp kms koa kob koe kok kom koo kop kor kos kpa kpe kpk kpm kpo kpp kpr kps kra krk kro krp krr krs ksa ksb kse ksk ksm kso ksp ksr kss m-o m-r maa mab mae mak mam mao map mar mas mba mbb mbe mbk mbm mbo mbp mbr mbs mea meb mee mek mem meo mep mer mes mka mkb mke mkk mkm mko mkp mkr mks mma mmb mme mmk mmm mmo mmp mmr mms moa mob moe mok mom moo mop mor mos mpa mpb mpe mpk mpm mpo mpp mpr mps mra mrb mre mrk mrm mro mrp mrr mrs msa msb mse msk msm mso msp msr mss oaa oab oae oak oam oao oap oar oas ob- oba obb obe obk obm obo obp obr obs oea oeb oee oem oeo oep oer oes oka okb oke okk oko okp okr oks om- oma omb ome omm omo omp omr oms oo- ooa oob ook oom ooo oop oor oos op- opa opb ope opk opm opo opp opr ops or- ora orb ore ork orm oro orp orr ors os- osa osb ose osk osm oso osp osr oss p-p paa pab pae pak pam pao pap par pas pba pbb pbe pbk pbm pbo pbp pbr pbs pea peb pee pek pem peo pep per pes pka pkb pke pkm pko pkp pkr pks pma pmb pme pmk pmm pmo pmp pmr pms poa pob poe pok pom poo pop por pos ppa ppb ppe ppk ppm ppo ppp ppr pps pra prb pre prk prm pro prp prr prs ps- psa psb pse psk psm pso psp psr pss ra- raa rab rae rak ram rao rap rar ras rba rbb rbe rbk rbm rbo rbp rbr rbs re- rea reb ree rek rem reo rep rer res rkb rke rkk rkm rko rkp rks rma rmb rme rmm rmo rmp rmr rms roa rob roe rok rom roo rop ror ros rpa rpb rpe rpk rpm rpo rpp rpr rps rra rrb rrk rrm rrp rrr rrs rsa rsb rse rsk rsm rso rsp rsr rss saa sab sae sak sam sao sap sar sas sba sbb sbe sbk sbm sbo sbp sbr sbs se- sea seb see sek sem seo sep ser ses sk- ska skb ske skk skm sko skp skr sks sma smb sme smk smm smo smp smr sms soa sob soe sok som soo sop sor sos spa spb spe spk spm spo spp spr sps sr- sra srb sre srk srm sro srp srr srs ss- ssa ssb sse ssk ssm sso ssp ssr sss