a-a a-b aaa aab aag aan aap aar aas ab- aba abb abg abn abp abr abs ag- aga agb agg agn agp agr ags an- ana anb ang ann anp anr ans ap- apa apb apg apn app apr aps ar- ara arb arg arn arp arr ars as- asa asb asg asn asp asr ass b-p baa bab bag ban bap bar bas bba bbb bbg bbn bbp bbr bbs bga bgb bgg bgn bgp bgr bgs bna bnb bng bnn bnp bnr bns bpa bpb bpg bpn bpp bpr bps bra brb brg brn brp brr brs bsa bsb bsg bsn bsp bsr bss g-p gaa gab gag gan gap gar gas gba gbg gbn gbp gbr gbs gga ggb ggg ggn ggp ggr ggs gna gnb gnn gnp gnr gns gpa gpb gpg gpn gpp gpr gps gra grb grg grn grp grr grs gsa gsb gsg gsn gsp gsr gss naa nab nag nan nap nar nas nba nbb nbg nbn nbp nbr nbs nga ngb ngg ngn ngp ngs nna nnb nng nnn nnp nns npa npb npg npn npp npr nps nra nrb nrg nrn nrp nrr nrs nsa nsb nsg nsn nsp nsr nss p-p paa pab pag pan pap par pas pba pbb pbg pbn pbp pbr pbs pga pgb pgg pgn pgp pgr pgs pn- pna pnb png pnn pnp pnr pns ppa ppb ppg ppn ppp ppr pps pra prb prg prn prp prr prs ps- psa psb psg psn psp psr pss ra- raa rab rag ran rap rar ras rba rbb rbg rbn rbp rbr rbs rga rgb rgg rgn rgp rgr rgs rna rnb rng rnn rnp rnr rns rpa rpb rpg rpn rpp rpr rps rra rrb rrg rrn rrp rrr rrs rsa rsb rsg rsn rsp rsr rss saa sab sag san sap sar sas sba sbb sbg sbn sbp sbr sbs sga sgb sgg sgn sgp sgr sgs sna snb sng snn snp snr sns spa spb spg spn spp spr sps sr- sra srb srg srn srp srr srs ss- ssa ssb ssg ssn ssp ssr sss