a-a a-b aaa aab aad aan aao aap aar aas ab- aba abb abd abn abo abp abr abs ad- ada adb add adn ado adp adr ads an- ana anb and ann ano anp anr ans aoa aob aod aon aoo aop aor aos ap- apa apb apd apn apo app apr aps ar- ara arb ard arn aro arp arr ars as- asa asb asd asn aso asp asr ass b-p baa bab bad ban bao bap bar bas bba bbb bbd bbn bbo bbp bbr bbs bda bdb bdd bdo bdp bdr bds bna bnb bnd bnn bno bnp bnr bns boa bob bod bon boo bop bor bos bpa bpb bpd bpn bpo bpp bpr bps bra brb brd brn bro brp brr brs bsa bsb bsd bsn bso bsp bsr bss daa dab dad dan dao dap dar das dba dbb dbd dbn dbo dbp dbr dbs dda ddb ddd ddn ddo ddp ddr dds dna dnb dnd dnn dno dnp dnr dns doa dob dod don doo dop dor dos dpa dpb dpd dpn dpo dpp dpr dps dra drb drd drn dro drp drr drs dsa dsb dsd dsn dso dsp dsr dss naa nab nad nan nao nap nar nas nba nbb nbd nbn nbo nbp nbr nbs nda ndb ndd ndn ndo ndp ndr nds nna nnb nnn nno nnp nns no- noa nob nod non noo nop nor nos npa npb npd npn npo npp npr nps nra nrb nrd nrn nro nrp nrr nrs nsa nsb nsd nsn nso nsp nsr nss oaa oab oad oan oao oap oar oas ob- oba obb obd obn obo obp obr obs oda odb odd odn odo odp odr ods on- ona onb ond onn ono onp onr ons oo- ooa oob ood oon ooo oop oor oos op- opa opb opd opn opo opp opr ops or- ora orb ord orn oro orp orr ors os- osa osb osd osn oso osp osr oss p-p paa pab pad pan pao pap par pas pba pbb pbd pbn pbo pbp pbr pbs pda pdb pdd pdn pdo pdp pdr pds pn- pna pnb pnd pnn pno pnp pnr pns poa pob pod pon poo pop por pos ppa ppb ppd ppn ppo ppp ppr pps pra prb prd prn pro prp prr prs ps- psa psb psd psn pso psp psr pss ra- raa rab rad ran rao rap rar ras rba rbb rbd rbn rbo rbp rbr rbs rda rdb rdd rdn rdo rdp rdr rds rna rnb rnd rnn rno rnp rnr rns roa rob rod ron roo rop ror ros rpa rpb rpd rpn rpo rpp rpr rps rra rrb rrd rrn rrp rrr rrs rsa rsb rsd rsn rso rsp rsr rss saa sab sad san sao sap sar sas sba sbb sbd sbn sbo sbp sbr sbs sda sdb sdd sdn sdo sdp sdr sds sna snb snd snn sno snp snr sns soa sob sod son soo sop sor sos spa spb spd spn spo spp spr sps sr- sra srb srd srn sro srp srr srs ss- ssa ssb ssd ssn sso ssp ssr sss