a-a a-b a-c aaa aab aac aah aan aao aap aar aas ab- aba abb abc abh abn abo abp abr abs ac- aca acb acc ach acn aco acp acr acs aha ahb ahc ahh ahn aho ahp ahr ahs an- ana anb anc anh ann ano anp anr ans aoa aob aoc aoh aon aoo aop aor aos ap- apa apb apc aph apn apo app apr aps ar- ara arb arc arh arn aro arp arr ars as- asa asb asc ash asn aso asp asr ass b-p baa bab bac bah ban bao bap bar bas bba bbb bbc bbh bbn bbo bbp bbr bbs bca bcb bcc bch bcn bco bcp bcr bcs bha bhb bhc bhh bho bhp bhr bhs bna bnb bnc bnn bno bnp bnr bns boa bob boc boh bon boo bop bor bos bpa bpb bpc bph bpn bpo bpp bpr bps bra brb brh brn bro brp brr brs bsa bsb bsc bsh bsn bso bsp bsr bss c-- caa cab cac cah can cao cap car cas cba cbb cbc cbh cbn cbo cbp cbr cbs cca ccb ccc cch ccn cco ccp ccr ccs ch- cha chb chc chh chn cho chp chr chs cn- cna cnb cnc cnh cnn cno cnp cnr cns co- coa cob coc coh con coo cop cor cos cpa cpb cpc cph cpn cpo cpp cpr cps cra crb crc crh crn cro crp crr crs csa csb csc csh csn cso csp csr css haa hab hac hah han hao hap har has hba hbb hbc hbh hbn hbo hbp hbr hbs hca hcb hcc hch hcn hco hcp hcr hcs hha hhb hhc hhh hhn hho hhp hhr hhs hna hnb hnc hnh hnn hno hns hoa hob hoc hoh hon hoo hop hor hos hpa hpb hpc hph hpn hpo hpp hpr hps hr- hra hrb hrc hrh hrn hro hrp hrr hrs hsa hsb hsc hsh hsn hsp hsr hss naa nab nac nah nan nao nap nar nas nba nbb nbc nbn nbo nbp nbr nbs nca ncb ncc nch ncn nco ncp ncr ncs nha nhb nhc nhh nhn nhp nhr nhs nna nnb nnc nnh nnn nno nnp nns no- noa nob noc noh non noo nop nor nos npa npb npc nph npn npo npp npr nps nra nrb nrc nrn nro nrp nrr nrs nsa nsb nsc nsh nsn nso nsp nsr nss oaa oab oac oah oan oao oap oar oas ob- oba obb obc obh obn obo obp obr obs oc- oca ocb occ och ocn oco ocp ocr ocs oha ohc ohh ohn oho ohp ohr ohs on- ona onb onc onh onn ono onp onr ons oo- ooa oob ooc ooh oon ooo oop oor oos op- opa opb opc oph opn opo opp opr ops or- ora orb orc orh orn oro orp orr ors os- osa osb osc osh osn oso osp osr oss p-p paa pab pac pah pan pao pap par pas pba pbb pbc pbn pbo pbp pbr pbs pca pcb pcc pch pcn pco pcp pcr pcs pha phb phc phn pho php phr phs pn- pna pnb pnc pnh pnn pno pnp pnr pns poa pob poc poh pon poo pop por pos ppa ppb ppc pph ppn ppo ppp ppr pps pra prb prc prh prn pro prp prr prs ps- psa psb psc psh psn pso psp psr pss ra- raa rab rac rah ran rao rap rar ras rba rbb rbc rbh rbn rbo rbp rbr rbs rca rcb rcc rch rcn rco rcp rcr rcs rh- rha rhb rhc rhh rhn rho rhp rhr rhs rna rnb rnc rnh rnn rno rnp rnr rns roa rob roc roh ron roo rop ror ros rpa rpb rpc rph rpn rpo rpp rpr rps rra rrb rrc rrh rrn rrp rrr rrs rsa rsb rsc rsh rsn rso rsp rsr rss saa sab sac sah san sao sap sar sas sba sbb sbc sbh sbn sbo sbp sbr sbs sca scb scc sch scn sco scp scr scs sh- sha shb shc shh shn sho shp shr shs sna snb snc snn sno snp snr sns soa sob soc soh son soo sop sor sos spa spb spc sph spn spo spp spr sps sr- sra srb src srh srn sro srp srr srs ss- ssa ssb ssc ssh ssn sso ssp ssr sss