-er a-a a-b a-c aaa aab aac aae aah aam aan aar ab- aba abb abc abe abh abm abn abr ac- aca acb acc ace ach acm acn acr aea aeb aec aee aeh aem aen aer aha ahb ahc ahe ahh ahm ahn ahr ama amb amc ame amh amm amn amr an- ana anb anc ane anh anm ann anr ar- ara arb arc are arh arm arn arr baa bab bac bae bah bam ban bar bba bbb bbc bbe bbh bbm bbn bbr bca bcb bcc bce bch bcm bcn bcr be- bea beb bec bee beh bem ben ber bha bhb bhc bhe bhh bhm bhr bma bmb bmc bme bmh bmm bmn bmr bna bnb bnc bne bnn bnr bra brb bre brh brm brn brr c-- caa cab cac cae cah cam can car cba cbb cbc cbe cbh cbm cbn cbr cca ccb ccc cce cch ccm ccn ccr ce- cea ceb cec cee ceh cem cen cer ch- cha chb chc che chh chm chn chr cma cmb cmc cme cmh cmm cmn cmr cn- cna cnb cnc cne cnh cnm cnn cnr cra crb crc cre crh crm crn crr eaa eab eac eae eah eam ean ear eba ebb ebc ebe ebh ebm ebn ebr ec- eca ecb ecc ece ech ecm ecn ecr eea eeb eec eee eem een eer eha ehb ehc ehe ehh ehm ehn ehr em- ema emb emc eme emh emm emn emr en- ena enb enc ene enh enm enn enr era erb erc ere erh erm ern err haa hab hac hae hah ham han har hba hbb hbc hbe hbh hbm hbn hbr hca hcb hcc hce hch hcm hcn hcr he- hea heb hec hee heh hem hen her hha hhb hhc hhe hhh hhm hhn hhr hma hmb hmc hme hmh hmm hmr hna hnb hnc hne hnh hnn hr- hra hrb hrc hre hrh hrm hrn hrr m-r maa mab mac mae mah mam man mar mba mbb mbc mbe mbh mbm mbr mc- mca mcb mcc mce mch mcm mcn mcr mea meb mec mee meh mem men mer mha mhc mhh mhm mhn mhr mma mmb mmc mme mmh mmm mmn mmr mna mnb mnc mne mnm mnn mnr mra mrb mrc mre mrh mrm mrn mrr naa nab nac nae nah nam nan nar nba nbb nbc nbe nbm nbn nbr nca ncb ncc nce nch ncm ncn ncr ne- nea neb nec nee neh nem nen ner nha nhb nhc nhe nhh nhm nhn nhr nma nmb nmc nme nmh nmm nmn nmr nna nnb nnc nne nnh nnm nnn nra nrb nrc nre nrm nrn nrr ra- raa rab rac rae rah ram ran rar rba rbb rbc rbe rbh rbm rbn rbr rca rcb rcc rce rch rcm rcn rcr re- rea reb rec ree reh rem ren rer rh- rha rhb rhc rhe rhh rhm rhn rhr rma rmb rmc rme rmh rmm rmn rmr rna rnb rnc rnh rnm rnn rnr rra rrb rrc rrh rrm rrn rrr