a-a a-b a-c aaa aab aac aae aah aan aas ab- aba abb abc abe abh abn abs ac- aca acb acc ace ach acn acs aea aeb aec aee aeh aen aes aha ahb ahc ahe ahh ahn ahs an- ana anb anc ane anh ann ans as- asa asb asc ase ash asn ass baa bab bac bae bah ban bas bba bbb bbc bbe bbh bbn bbs bca bcb bcc bce bch bcn bcs be- bea beb bec bee beh ben bes bha bhb bhc bhe bhh bhs bna bnb bnc bne bnn bns bsa bsb bsc bse bsh bsn bss c-- caa cab cac cae cah can cas cba cbb cbc cbe cbh cbn cbs cca ccb ccc cce cch ccn ccs ce- cea ceb cec cee ceh cen ces ch- cha chb chc che chh chn chs cn- cna cnb cnc cne cnh cnn cns csa csb csc cse csh csn css eaa eab eac eae eah ean eas eba ebb ebc ebe ebh ebn ebs ec- eca ecb ecc ece ech ecn ecs eea eeb eec eee een ees eha ehb ehc ehe ehh ehn ehs en- ena enb enc ene enh enn ens es- esa esb esc ese esh esn ess haa hab hac hae hah han has hba hbb hbc hbe hbh hbn hbs hca hcb hcc hce hch hcn hcs he- hea heb hec hee heh hen hes hha hhb hhc hhe hhh hhn hhs hna hnb hnc hne hnh hnn hns hsa hsb hsc hse hsh hsn hss naa nab nac nae nah nan nas nba nbb nbc nbe nbn nbs nca ncb ncc nce nch ncn ncs ne- nea neb nec nee neh nen nes nha nhb nhc nhe nhh nhn nhs nna nnb nnc nne nnh nnn nns nsa nsb nsc nse nsh nsn nss saa sab sac sae sah san sas sba sbb sbc sbe sbh sbn sbs sca scb scc sce sch scn scs se- sea seb sec see seh sen ses sh- sha shb shc she shh shn shs sna snb snc sne snn sns ss- ssa ssb ssc sse ssh ssn sss