-er a-a a-b a-c aaa aab aac aad aae aam aan aar ab- aba abb abc abd abe abm abn abr ac- aca acb acc acd ace acm acn acr ad- ada adb adc add ade adm adn adr aea aeb aec aed aee aem aen aer ama amb amc amd ame amm amn amr an- ana anb anc and ane anm ann anr ar- ara arb arc ard are arm arn arr baa bab bac bad bae bam ban bar bba bbb bbc bbd bbe bbm bbn bbr bca bcb bcc bcd bce bcm bcn bcr bda bdb bdc bdd bde bdm bdr be- bea beb bec bed bee bem ben ber bma bmb bmc bmd bme bmm bmn bmr bna bnb bnc bnd bne bnn bnr bra brb brd bre brm brn brr c-- caa cab cac cad cae cam can car cba cbb cbc cbd cbe cbm cbn cbr cca ccb ccc ccd cce ccm ccn ccr cda cdb cdc cdd cde cdm cdn cdr ce- cea ceb cec ced cee cem cen cer cma cmb cmc cmd cme cmm cmn cmr cn- cna cnb cnc cnd cne cnm cnn cnr cra crb crc crd cre crm crn crr daa dab dac dad dae dam dan dar dba dbb dbc dbd dbe dbm dbn dbr dca dcb dcc dcd dce dcm dcn dcr dda ddb ddc ddd dde ddm ddn ddr de- dea deb dec ded dee dem den der dma dmb dmc dmd dme dmm dmn dmr dna dnb dnc dnd dne dnm dnn dnr dra drb drc drd dre drm drn drr eaa eab eac ead eae eam ean ear eba ebb ebc ebd ebe ebm ebn ebr ec- eca ecb ecc ecd ece ecm ecn ecr ed- eda edb edc edd ede edm edn edr eea eeb eec eed eee eem een eer em- ema emb emc emd eme emm emn emr en- ena enb enc end ene enm enn enr era erb erc erd ere erm ern err m-r maa mab mac mad mae mam man mar mba mbb mbc mbd mbe mbm mbr mc- mca mcb mcc mcd mce mcm mcn mcr mda mdb mdc mdd mde mdm mdn mdr mea meb mec med mee mem men mer mma mmb mmc mmd mme mmm mmn mmr mna mnb mnc mne mnm mnn mnr mra mrb mrc mrd mre mrm mrn mrr naa nab nac nad nae nam nan nar nba nbb nbc nbd nbe nbm nbn nbr nca ncb ncc ncd nce ncm ncn ncr nda ndb ndc ndd nde ndm ndn ndr ne- nea neb nec ned nee nem nen ner nma nmb nmc nmd nme nmm nmn nmr nna nnb nnc nne nnm nnn nra nrb nrc nrd nre nrm nrn nrr ra- raa rab rac rad rae ram ran rar rba rbb rbc rbd rbe rbm rbn rbr rca rcb rcc rcd rce rcm rcn rcr rda rdb rdc rdd rde rdm rdn rdr re- rea reb rec red ree rem ren rer rma rmb rmc rmd rme rmm rmn rmr rna rnb rnc rnd rnm rnn rnr rra rrb rrc rrd rrm rrn rrr