a-a a-b a-c aaa aab aac aae aah aam aan ab- aba abb abc abe abh abm abn ac- aca acb acc ace ach acm acn aea aeb aec aee aeh aem aen aha ahb ahc ahe ahh ahm ahn ama amb amc ame amh amm amn an- ana anb anc ane anh anm ann baa bab bac bae bah bam ban bba bbb bbc bbe bbh bbm bbn bca bcb bcc bce bch bcm bcn be- bea beb bec bee beh bem ben bha bhb bhc bhe bhh bhm bma bmb bmc bme bmh bmm bmn bna bnb bnc bne bnn c-- caa cab cac cae cah cam can cba cbb cbc cbe cbh cbm cbn cca ccb ccc cce cch ccm ccn ce- cea ceb cec cee ceh cem cen ch- cha chb chc che chh chm chn cma cmb cmc cme cmh cmm cmn cn- cna cnb cnc cne cnh cnm cnn eaa eab eac eae eah eam ean eba ebb ebc ebe ebh ebm ebn ec- eca ecb ecc ece ech ecm ecn eea eeb eec eee eem een eha ehb ehc ehe ehh ehm ehn em- ema emb emc eme emh emm emn en- ena enb enc ene enh enm enn haa hab hac hae hah ham han hba hbb hbc hbe hbh hbm hbn hca hcb hcc hce hch hcm hcn he- hea heb hec hee heh hem hen hha hhb hhc hhe hhh hhm hhn hma hmb hmc hme hmh hmm hna hnb hnc hne hnh hnn maa mab mac mae mah mam man mba mbb mbc mbe mbh mbm mc- mca mcb mcc mce mch mcm mcn mea meb mec mee meh mem men mha mhc mhh mhm mhn mma mmb mmc mme mmh mmm mmn mna mnb mnc mne mnm mnn naa nab nac nae nah nam nan nba nbb nbc nbe nbm nbn nca ncb ncc nce nch ncm ncn ne- nea neb nec nee neh nem nen nha nhb nhc nhe nhh nhm nhn nma nmb nmc nme nmh nmm nmn nna nnb nnc nne nnh nnm nnn