-er a-a a-b a-c aaa aab aac aad aae aam aar aas ab- aba abb abc abd abe abm abr abs ac- aca acb acc acd ace acm acr acs ad- ada adb adc add ade adm adr ads aea aeb aec aed aee aem aer aes ama amb amc amd ame amm amr ams ar- ara arb arc ard are arm arr ars as- asa asb asc asd ase asm asr ass baa bab bac bad bae bam bar bas bba bbb bbc bbd bbe bbm bbr bbs bca bcb bcc bcd bce bcm bcr bcs bda bdb bdc bdd bde bdm bdr bds be- bea beb bec bed bee bem ber bes bma bmb bmc bmd bme bmm bmr bms bra brb brd bre brm brr brs bsa bsb bsc bsd bse bsm bsr bss c-- caa cab cac cad cae cam car cas cba cbb cbc cbd cbe cbm cbr cbs cca ccb ccc ccd cce ccm ccr ccs cda cdb cdc cdd cde cdm cdr cds ce- cea ceb cec ced cee cem cer ces cma cmb cmc cmd cme cmm cmr cms cra crb crc crd cre crm crr crs csa csb csc csd cse csm csr css daa dab dac dad dae dam dar das dba dbb dbc dbd dbe dbm dbr dbs dca dcb dcc dcd dce dcm dcr dcs dda ddb ddc ddd dde ddm ddr dds de- dea deb dec ded dee dem der des dma dmb dmc dmd dme dmm dmr dms dra drb drc drd dre drm drr drs dsa dsb dsc dsd dse dsm dsr dss eaa eab eac ead eae eam ear eas eba ebb ebc ebd ebe ebm ebr ebs ec- eca ecb ecc ecd ece ecm ecr ecs ed- eda edb edc edd ede edm edr eds eea eeb eec eed eee eem eer ees em- ema emb emc emd eme emm emr ems era erb erc erd ere erm err ers es- esa esb esc esd ese esm esr ess m-r maa mab mac mad mae mam mar mas mba mbb mbc mbd mbe mbm mbr mbs mc- mca mcb mcc mcd mce mcm mcr mcs mda mdb mdc mdd mde mdm mdr mds mea meb mec med mee mem mer mes mma mmb mmc mmd mme mmm mmr mms mra mrb mrc mrd mre mrm mrr mrs msa msb msc msd mse msm msr mss ra- raa rab rac rad rae ram rar ras rba rbb rbc rbd rbe rbm rbr rbs rca rcb rcc rcd rce rcm rcr rcs rda rdb rdc rdd rde rdm rdr rds re- rea reb rec red ree rem rer res rma rmb rmc rmd rme rmm rmr rms rra rrb rrc rrd rrm rrr rrs rsa rsb rsc rsd rse rsm rsr rss saa sab sac sad sae sam sar sas sba sbb sbc sbd sbe sbm sbr sbs sca scb scc scd sce scm scr scs sda sdb sdc sdd sde sdm sdr sds se- sea seb sec sed see sem ser ses sma smb smc smd sme smm smr sms sr- sra srb src srd sre srm srr srs ss- ssa ssb ssc ssd sse ssm ssr sss