a-a a-b aaa aab aad aan aap aar aas ab- aba abb abd abn abp abr abs ad- ada adb add adn adp adr ads an- ana anb and ann anp anr ans ap- apa apb apd apn app apr aps ar- ara arb ard arn arp arr ars as- asa asb asd asn asp asr ass b-p baa bab bad ban bap bar bas bba bbb bbd bbn bbp bbr bbs bda bdb bdd bdp bdr bds bna bnb bnd bnn bnp bnr bns bpa bpb bpd bpn bpp bpr bps bra brb brd brn brp brr brs bsa bsb bsd bsn bsp bsr bss daa dab dad dan dap dar das dba dbb dbd dbn dbp dbr dbs dda ddb ddd ddn ddp ddr dds dna dnb dnd dnn dnp dnr dns dpa dpb dpd dpn dpp dpr dps dra drb drd drn drp drr drs dsa dsb dsd dsn dsp dsr dss naa nab nad nan nap nar nas nba nbb nbd nbn nbp nbr nbs nda ndb ndd ndn ndp ndr nds nna nnb nnn nnp nns npa npb npd npn npp npr nps nra nrb nrd nrn nrp nrr nrs nsa nsb nsd nsn nsp nsr nss p-p paa pab pad pan pap par pas pba pbb pbd pbn pbp pbr pbs pda pdb pdd pdn pdp pdr pds pn- pna pnb pnd pnn pnp pnr pns ppa ppb ppd ppn ppp ppr pps pra prb prd prn prp prr prs ps- psa psb psd psn psp psr pss ra- raa rab rad ran rap rar ras rba rbb rbd rbn rbp rbr rbs rda rdb rdd rdn rdp rdr rds rna rnb rnd rnn rnp rnr rns rpa rpb rpd rpn rpp rpr rps rra rrb rrd rrn rrp rrr rrs rsa rsb rsd rsn rsp rsr rss saa sab sad san sap sar sas sba sbb sbd sbn sbp sbr sbs sda sdb sdd sdn sdp sdr sds sna snb snd snn snp snr sns spa spb spd spn spp spr sps sr- sra srb srd srn srp srr srs ss- ssa ssb ssd ssn ssp ssr sss