-er a-a a-b a-c aaa aab aac aae aam aan aap aar aas ab- aba abb abc abe abm abn abp abr abs ac- aca acb acc ace acm acn acp acr acs aea aeb aec aee aem aen aep aer aes ama amb amc ame amm amn amp amr ams an- ana anb anc ane anm ann anp anr ans ap- apa apb apc ape apm apn app apr aps ar- ara arb arc are arm arn arp arr ars as- asa asb asc ase asm asn asp asr ass b-p baa bab bac bae bam ban bap bar bas bba bbb bbc bbe bbm bbn bbp bbr bbs bca bcb bcc bce bcm bcn bcp bcr bcs be- bea beb bec bee bem ben bep ber bes bma bmb bmc bme bmm bmn bmp bmr bms bna bnb bnc bne bnn bnp bnr bns bpa bpb bpc bpe bpm bpn bpp bpr bps bra brb bre brm brn brp brr brs bsa bsb bsc bse bsm bsn bsp bsr bss c-- caa cab cac cae cam can cap car cas cba cbb cbc cbe cbm cbn cbp cbr cbs cca ccb ccc cce ccm ccn ccp ccr ccs ce- cea ceb cec cee cem cen cep cer ces cma cmb cmc cme cmm cmn cmp cmr cms cn- cna cnb cnc cne cnm cnn cnp cnr cns cpa cpb cpc cpe cpm cpn cpp cpr cps cra crb crc cre crm crn crp crr crs csa csb csc cse csm csn csp csr css eaa eab eac eae eam ean eap ear eas eba ebb ebc ebe ebm ebn ebp ebr ebs ec- eca ecb ecc ece ecm ecn ecr ecs eea eeb eec eee eem een eep eer ees em- ema emb emc eme emm emn emp emr ems en- ena enb enc ene enm enn enp enr ens ep- epa epb epc epe epm epn epp epr eps era erb erc ere erm ern erp err ers es- esa esb esc ese esm esn esp esr ess m-r maa mab mac mae mam man map mar mas mba mbb mbc mbe mbm mbp mbr mbs mc- mca mcb mcc mce mcm mcn mcp mcr mcs mea meb mec mee mem men mep mer mes mma mmb mmc mme mmm mmn mmp mmr mms mna mnb mnc mne mnm mnn mnp mnr mns mpa mpb mpc mpe mpm mpn mpp mpr mps mra mrb mrc mre mrm mrn mrp mrr mrs msa msb msc mse msm msn msp msr mss naa nab nac nae nam nan nap nar nas nba nbb nbc nbe nbm nbn nbp nbr nbs nca ncb ncc nce ncm ncn ncp ncr ncs ne- nea neb nec nee nem nen nep ner nes nma nmb nmc nme nmm nmn nmp nmr nms nna nnb nnc nne nnm nnn nnp nns npa npb npc npe npm npn npp npr nps nra nrb nrc nre nrm nrn nrp nrr nrs nsa nsb nsc nse nsm nsn nsp nsr nss p-p paa pab pac pae pam pan pap par pas pba pbb pbc pbe pbm pbn pbp pbr pbs pca pcb pcc pce pcm pcn pcp pcr pcs pea peb pec pee pem pen pep per pes pma pmb pmc pme pmm pmn pmp pmr pms pn- pna pnb pnc pne pnm pnn pnp pnr pns ppa ppb ppc ppe ppm ppn ppp ppr pps pra prb prc pre prm prn prp prr prs ps- psa psb psc pse psm psn psp psr pss ra- raa rab rac rae ram ran rap rar ras rba rbb rbc rbe rbm rbn rbp rbr rbs rca rcb rcc rce rcm rcn rcp rcr rcs re- rea reb rec ree rem ren rep rer res rma rmb rmc rme rmm rmn rmp rmr rms rna rnb rnc rnm rnn rnp rnr rns rpa rpb rpc rpe rpm rpn rpp rpr rps rra rrb rrc rrm rrn rrp rrr rrs rsa rsb rsc rse rsm rsn rsp rsr rss saa sab sac sae sam san sap sar sas sba sbb sbc sbe sbm sbn sbp sbr sbs sca scb scc sce scm scn scp scr scs se- sea seb sec see sem sen sep ser ses sma smb smc sme smm smn smp smr sms sna snb snc sne snm snn snp snr sns spa spb spc spe spm spn spp spr sps sr- sra srb src sre srm srn srp srr srs ss- ssa ssb ssc sse ssm ssn ssp ssr sss