a-a a-b aaa aab aag aan aao aap aar aas ab- aba abb abg abn abo abp abr abs ag- aga agb agg agn ago agp agr ags an- ana anb ang ann ano anp anr ans aoa aob aog aon aoo aop aor aos ap- apa apb apg apn apo app apr aps ar- ara arb arg arn aro arp arr ars as- asa asb asg asn aso asp asr ass b-p baa bab bag ban bao bap bar bas bba bbb bbg bbn bbo bbp bbr bbs bga bgb bgg bgn bgo bgp bgr bgs bna bnb bng bnn bno bnp bnr bns boa bob bog bon boo bop bor bos bpa bpb bpg bpn bpo bpp bpr bps bra brb brg brn bro brp brr brs bsa bsb bsg bsn bso bsp bsr bss g-p gaa gab gag gan gao gap gar gas gba gbg gbn gbo gbp gbr gbs gga ggb ggg ggn ggo ggp ggr ggs gna gnb gnn gno gnp gnr gns goa gob gog gon goo gop gor gos gpa gpb gpg gpn gpo gpp gpr gps gra grb grg grn gro grp grr grs gsa gsb gsg gsn gso gsp gsr gss naa nab nag nan nao nap nar nas nba nbb nbg nbn nbo nbp nbr nbs nga ngb ngg ngn ngo ngp ngs nna nnb nng nnn nno nnp nns no- noa nob nog non noo nop nor nos npa npb npg npn npo npp npr nps nra nrb nrg nrn nro nrp nrr nrs nsa nsb nsg nsn nso nsp nsr nss oaa oab oag oan oao oap oar oas ob- oba obb obg obn obo obp obr obs oga ogg ogn ogo ogp ogs on- ona onb ong onn ono onp onr ons oo- ooa oob oog oon ooo oop oor oos op- opa opb opg opn opo opp opr ops or- ora orb org orn oro orp orr ors os- osa osb osg osn oso osp osr oss p-p paa pab pag pan pao pap par pas pba pbb pbg pbn pbo pbp pbr pbs pga pgb pgg pgn pgo pgp pgr pgs pn- pna pnb png pnn pno pnp pnr pns poa pob pog pon poo pop por pos ppa ppb ppg ppn ppo ppp ppr pps pra prb prg prn pro prp prr prs ps- psa psb psg psn pso psp psr pss ra- raa rab rag ran rao rap rar ras rba rbb rbg rbn rbo rbp rbr rbs rga rgb rgg rgn rgo rgp rgr rgs rna rnb rng rnn rno rnp rnr rns roa rob rog ron roo rop ror ros rpa rpb rpg rpn rpo rpp rpr rps rra rrb rrg rrn rrp rrr rrs rsa rsb rsg rsn rso rsp rsr rss saa sab sag san sao sap sar sas sba sbb sbg sbn sbo sbp sbr sbs sga sgb sgg sgn sgo sgp sgr sgs sna snb sng snn sno snp snr sns soa sob sog son soo sop sor sos spa spb spg spn spo spp spr sps sr- sra srb srg srn sro srp srr srs ss- ssa ssb ssg ssn sso ssp ssr sss