a-a a-b a-c aaa aab aac aah aan aao aar aas ab- aba abb abc abh abn abo abr abs ac- aca acb acc ach acn aco acr acs aha ahb ahc ahh ahn aho ahr ahs an- ana anb anc anh ann ano anr ans aoa aob aoc aoh aon aoo aor aos ar- ara arb arc arh arn aro arr ars as- asa asb asc ash asn aso asr ass baa bab bac bah ban bao bar bas bba bbb bbc bbh bbn bbo bbr bbs bca bcb bcc bch bcn bco bcr bcs bha bhb bhc bhh bho bhr bhs bna bnb bnc bnn bno bnr bns boa bob boc boh bon boo bor bos bra brb brh brn bro brr brs bsa bsb bsc bsh bsn bso bsr bss c-- caa cab cac cah can cao car cas cba cbb cbc cbh cbn cbo cbr cbs cca ccb ccc cch ccn cco ccr ccs ch- cha chb chc chh chn cho chr chs cn- cna cnb cnc cnh cnn cno cnr cns co- coa cob coc coh con coo cor cos cra crb crc crh crn cro crr crs csa csb csc csh csn cso csr css haa hab hac hah han hao har has hba hbb hbc hbh hbn hbo hbr hbs hca hcb hcc hch hcn hco hcr hcs hha hhb hhc hhh hhn hho hhr hhs hna hnb hnc hnh hnn hno hns hoa hob hoc hoh hon hoo hor hos hr- hra hrb hrc hrh hrn hro hrr hrs hsa hsb hsc hsh hsn hsr hss naa nab nac nah nan nao nar nas nba nbb nbc nbn nbo nbr nbs nca ncb ncc nch ncn nco ncr ncs nha nhb nhc nhh nhn nhr nhs nna nnb nnc nnh nnn nno nns no- noa nob noc noh non noo nor nos nra nrb nrc nrn nro nrr nrs nsa nsb nsc nsh nsn nso nsr nss oaa oab oac oah oan oao oar oas ob- oba obb obc obh obn obo obr obs oc- oca ocb occ och ocn oco ocr ocs oha ohc ohh ohn oho ohr ohs on- ona onb onc onh onn ono onr ons oo- ooa oob ooc ooh oon ooo oor oos or- ora orb orc orh orn oro orr ors os- osa osb osc osh osn oso osr oss ra- raa rab rac rah ran rao rar ras rba rbb rbc rbh rbn rbo rbr rbs rca rcb rcc rch rcn rco rcr rcs rh- rha rhb rhc rhh rhn rho rhr rhs rna rnb rnc rnh rnn rno rnr rns roa rob roc roh ron roo ror ros rra rrb rrc rrh rrn rrr rrs rsa rsb rsc rsh rsn rso rsr rss saa sab sac sah san sao sar sas sba sbb sbc sbh sbn sbo sbr sbs sca scb scc sch scn sco scr scs sh- sha shb shc shh shn sho shr shs sna snb snc snn sno snr sns soa sob soc soh son soo sor sos sr- sra srb src srh srn sro srr srs ss- ssa ssb ssc ssh ssn sso ssr sss