a-a a-b a-t aaa aab aad aan aao aap aar aas aat ab- aba abb abd abn abo abp abr abs abt ad- ada adb add adn ado adp adr ads adt an- ana anb and ann ano anp anr ans ant aoa aob aod aon aoo aop aor aos aot ap- apa apb apd apn apo app apr aps apt ar- ara arb ard arn aro arp arr ars art as- asa asb asd asn aso asp asr ass ast at- ata atb atd atn ato atp atr ats att b-p baa bab bad ban bao bap bar bas bat bba bbb bbd bbn bbo bbp bbr bbs bbt bda bdb bdd bdo bdp bdr bds bdt bna bnb bnd bnn bno bnp bnr bns bnt boa bob bod bon boo bop bor bos bot bpa bpb bpd bpn bpo bpp bpr bps bpt bra brb brd brn bro brp brr brs brt bsa bsb bsd bsn bso bsp bsr bss bst bta btb btd btn bto btp btr bts btt daa dab dad dan dao dap dar das dat dba dbb dbd dbn dbo dbp dbr dbs dbt dda ddb ddd ddn ddo ddp ddr dds ddt dna dnb dnd dnn dno dnp dnr dns dnt doa dob dod don doo dop dor dos dot dpa dpb dpd dpn dpo dpp dpr dps dpt dra drb drd drn dro drp drr drs drt dsa dsb dsd dsn dso dsp dsr dss dst dta dtb dtd dtn dto dtp dtr dts dtt naa nab nad nan nao nap nar nas nat nba nbb nbd nbn nbo nbp nbr nbs nbt nda ndb ndd ndn ndo ndp ndr nds ndt nna nnb nnn nno nnp nns nnt no- noa nob nod non noo nop nor nos not npa npb npd npn npo npp npr nps npt nra nrb nrd nrn nro nrp nrr nrs nrt nsa nsb nsd nsn nso nsp nsr nss nst nta ntb ntd ntn nto ntp ntr nts ntt oaa oab oad oan oao oap oar oas oat ob- oba obb obd obn obo obp obr obs obt oda odb odd odn odo odp odr ods odt on- ona onb ond onn ono onp onr ons ont oo- ooa oob ood oon ooo oop oor oos oot op- opa opb opd opn opo opp opr ops opt or- ora orb ord orn oro orp orr ors ort os- osa osb osd osn oso osp osr oss ost ot- ota otb otd otn oto otp otr ots ott p-p paa pab pad pan pao pap par pas pat pba pbb pbd pbn pbo pbp pbr pbs pbt pda pdb pdd pdn pdo pdp pdr pds pdt pn- pna pnb pnd pnn pno pnp pnr pns pnt poa pob pod pon poo pop por pos pot ppa ppb ppd ppn ppo ppp ppr pps ppt pra prb prd prn pro prp prr prs prt ps- psa psb psd psn pso psp psr pss pst pt- pta ptb ptd ptn pto ptp ptr pts ptt ra- raa rab rad ran rao rap rar ras rat rba rbb rbd rbn rbo rbp rbr rbs rbt rda rdb rdd rdn rdo rdp rdr rds rdt rna rnb rnd rnn rno rnp rnr rns rnt roa rob rod ron roo rop ror ros rot rpa rpb rpd rpn rpo rpp rpr rps rpt rra rrb rrd rrn rrp rrr rrs rrt rsa rsb rsd rsn rso rsp rsr rss rst rta rtb rtd rtn rto rtp rtr rts rtt saa sab sad san sao sap sar sas sat sba sbb sbd sbn sbo sbp sbr sbs sbt sda sdb sdd sdn sdo sdp sdr sds sdt sna snb snd snn sno snp snr sns snt soa sob sod son soo sop sor sos sot spa spb spd spn spo spp spr sps spt sr- sra srb srd srn sro srp srr srs srt ss- ssa ssb ssd ssn sso ssp ssr sss sst sta stb std stn sto stp str sts stt taa tab tad tan tao tap tar tas tat tba tbb tbd tbn tbo tbp tbr tbs tbt tda tdb tdd tdn tdo tdp tdr tds tdt tna tnb tnd tnn tno tnp tnr tns tnt to- toa tob tod ton too top tor tos tot tpa tpb tpd tpn tpo tpp tpr tps tpt tra trb trd trn tro trp trr trs trt tsa tsb tsd tsn tso tsp tsr tss tst tta ttb ttd ttn tto ttp ttr tts ttt