a-a a-b a-c aaa aab aac aah aan aar aas ab- aba abb abc abh abn abr abs ac- aca acb acc ach acn acr acs aha ahb ahc ahh ahn ahr ahs an- ana anb anc anh ann anr ans ar- ara arb arc arh arn arr ars as- asa asb asc ash asn asr ass baa bab bac bah ban bar bas bba bbb bbc bbh bbn bbr bbs bca bcb bcc bch bcn bcr bcs bha bhb bhc bhh bhr bhs bna bnb bnc bnn bnr bns bra brb brh brn brr brs bsa bsb bsc bsh bsn bsr bss c-- caa cab cac cah can car cas cba cbb cbc cbh cbn cbr cbs cca ccb ccc cch ccn ccr ccs ch- cha chb chc chh chn chr chs cn- cna cnb cnc cnh cnn cnr cns cra crb crc crh crn crr crs csa csb csc csh csn csr css haa hab hac hah han har has hba hbb hbc hbh hbn hbr hbs hca hcb hcc hch hcn hcr hcs hha hhb hhc hhh hhn hhr hhs hna hnb hnc hnh hnn hns hr- hra hrb hrc hrh hrn hrr hrs hsa hsb hsc hsh hsn hsr hss naa nab nac nah nan nar nas nba nbb nbc nbn nbr nbs nca ncb ncc nch ncn ncr ncs nha nhb nhc nhh nhn nhr nhs nna nnb nnc nnh nnn nns nra nrb nrc nrn nrr nrs nsa nsb nsc nsh nsn nsr nss ra- raa rab rac rah ran rar ras rba rbb rbc rbh rbn rbr rbs rca rcb rcc rch rcn rcr rcs rh- rha rhb rhc rhh rhn rhr rhs rna rnb rnc rnh rnn rnr rns rra rrb rrc rrh rrn rrr rrs rsa rsb rsc rsh rsn rsr rss saa sab sac sah san sar sas sba sbb sbc sbh sbn sbr sbs sca scb scc sch scn scr scs sh- sha shb shc shh shn shr shs sna snb snc snn snr sns sr- sra srb src srh srn srr srs ss- ssa ssb ssc ssh ssn ssr sss