a-a a-b a-c aaa aab aac aah aan aas ab- aba abb abc abh abn abs ac- aca acb acc ach acn acs aha ahb ahc ahh ahn ahs an- ana anb anc anh ann ans as- asa asb asc ash asn ass baa bab bac bah ban bas bba bbb bbc bbh bbn bbs bca bcb bcc bch bcn bcs bha bhb bhc bhh bhs bna bnb bnc bnn bns bsa bsb bsc bsh bsn bss c-- caa cab cac cah can cas cba cbb cbc cbh cbn cbs cca ccb ccc cch ccn ccs ch- cha chb chc chh chn chs cn- cna cnb cnc cnh cnn cns csa csb csc csh csn css haa hab hac hah han has hba hbb hbc hbh hbn hbs hca hcb hcc hch hcn hcs hha hhb hhc hhh hhn hhs hna hnb hnc hnh hnn hns hsa hsb hsc hsh hsn hss naa nab nac nah nan nas nba nbb nbc nbn nbs nca ncb ncc nch ncn ncs nha nhb nhc nhh nhn nhs nna nnb nnc nnh nnn nns nsa nsb nsc nsh nsn nss saa sab sac sah san sas sba sbb sbc sbh sbn sbs sca scb scc sch scn scs sh- sha shb shc shh shn shs sna snb snc snn sns ss- ssa ssb ssc ssh ssn sss