-er a-a a-b a-c aaa aab aac aad aae aam aap aar ab- aba abb abc abd abe abm abp abr ac- aca acb acc acd ace acm acp acr ad- ada adb adc add ade adm adp adr aea aeb aec aed aee aem aep aer ama amb amc amd ame amm amp amr ap- apa apb apc apd ape apm app apr ar- ara arb arc ard are arm arp arr b-p baa bab bac bad bae bam bap bar bba bbb bbc bbd bbe bbm bbp bbr bca bcb bcc bcd bce bcm bcp bcr bda bdb bdc bdd bde bdm bdp bdr be- bea beb bec bed bee bem bep ber bma bmb bmc bmd bme bmm bmp bmr bpa bpb bpc bpd bpe bpm bpp bpr bra brb brd bre brm brp brr c-- caa cab cac cad cae cam cap car cba cbb cbc cbd cbe cbm cbp cbr cca ccb ccc ccd cce ccm ccp ccr cda cdb cdc cdd cde cdm cdp cdr ce- cea ceb cec ced cee cem cep cer cma cmb cmc cmd cme cmm cmp cmr cpa cpb cpc cpd cpe cpm cpp cpr cra crb crc crd cre crm crp crr daa dab dac dad dae dam dap dar dba dbb dbc dbd dbe dbm dbp dbr dca dcb dcc dcd dce dcm dcp dcr dda ddb ddc ddd dde ddm ddp ddr de- dea deb dec ded dee dem dep der dma dmb dmc dmd dme dmm dmp dmr dpa dpb dpc dpd dpe dpm dpp dpr dra drb drc drd dre drm drp drr eaa eab eac ead eae eam eap ear eba ebb ebc ebd ebe ebm ebp ebr ec- eca ecb ecc ecd ece ecm ecr ed- eda edb edc edd ede edm edp edr eea eeb eec eed eee eem eep eer em- ema emb emc emd eme emm emp emr ep- epa epb epc epd epe epm epp epr era erb erc erd ere erm erp err m-r maa mab mac mad mae mam map mar mba mbb mbc mbd mbe mbm mbp mbr mc- mca mcb mcc mcd mce mcm mcp mcr mda mdb mdc mdd mde mdm mdp mdr mea meb mec med mee mem mep mer mma mmb mmc mmd mme mmm mmp mmr mpa mpb mpc mpd mpe mpm mpp mpr mra mrb mrc mrd mre mrm mrp mrr p-p paa pab pac pad pae pam pap par pba pbb pbc pbd pbe pbm pbp pbr pca pcb pcc pcd pce pcm pcp pcr pda pdb pdc pdd pde pdm pdp pdr pea peb pec ped pee pem pep per pma pmb pmc pmd pme pmm pmp pmr ppa ppb ppc ppd ppe ppm ppp ppr pra prb prc prd pre prm prp prr ra- raa rab rac rad rae ram rap rar rba rbb rbc rbd rbe rbm rbp rbr rca rcb rcc rcd rce rcm rcp rcr rda rdb rdc rdd rde rdm rdp rdr re- rea reb rec red ree rem rep rer rma rmb rmc rmd rme rmm rmp rmr rpa rpb rpc rpd rpe rpm rpp rpr rra rrb rrc rrd rrm rrp rrr