a-a a-b a-t aaa aab aad aao aap aar aas aat ab- aba abb abd abo abp abr abs abt ad- ada adb add ado adp adr ads adt aoa aob aod aoo aop aor aos aot ap- apa apb apd apo app apr aps apt ar- ara arb ard aro arp arr ars art as- asa asb asd aso asp asr ass ast at- ata atb atd ato atp atr ats att b-p baa bab bad bao bap bar bas bat bba bbb bbd bbo bbp bbr bbs bbt bda bdb bdd bdo bdp bdr bds bdt boa bob bod boo bop bor bos bot bpa bpb bpd bpo bpp bpr bps bpt bra brb brd bro brp brr brs brt bsa bsb bsd bso bsp bsr bss bst bta btb btd bto btp btr bts btt daa dab dad dao dap dar das dat dba dbb dbd dbo dbp dbr dbs dbt dda ddb ddd ddo ddp ddr dds ddt doa dob dod doo dop dor dos dot dpa dpb dpd dpo dpp dpr dps dpt dra drb drd dro drp drr drs drt dsa dsb dsd dso dsp dsr dss dst dta dtb dtd dto dtp dtr dts dtt oaa oab oad oao oap oar oas oat ob- oba obb obd obo obp obr obs obt oda odb odd odo odp odr ods odt oo- ooa oob ood ooo oop oor oos oot op- opa opb opd opo opp opr ops opt or- ora orb ord oro orp orr ors ort os- osa osb osd oso osp osr oss ost ot- ota otb otd oto otp otr ots ott p-p paa pab pad pao pap par pas pat pba pbb pbd pbo pbp pbr pbs pbt pda pdb pdd pdo pdp pdr pds pdt poa pob pod poo pop por pos pot ppa ppb ppd ppo ppp ppr pps ppt pra prb prd pro prp prr prs prt ps- psa psb psd pso psp psr pss pst pt- pta ptb ptd pto ptp ptr pts ptt ra- raa rab rad rao rap rar ras rat rba rbb rbd rbo rbp rbr rbs rbt rda rdb rdd rdo rdp rdr rds rdt roa rob rod roo rop ror ros rot rpa rpb rpd rpo rpp rpr rps rpt rra rrb rrd rrp rrr rrs rrt rsa rsb rsd rso rsp rsr rss rst rta rtb rtd rto rtp rtr rts rtt saa sab sad sao sap sar sas sat sba sbb sbd sbo sbp sbr sbs sbt sda sdb sdd sdo sdp sdr sds sdt soa sob sod soo sop sor sos sot spa spb spd spo spp spr sps spt sr- sra srb srd sro srp srr srs srt ss- ssa ssb ssd sso ssp ssr sss sst sta stb std sto stp str sts stt taa tab tad tao tap tar tas tat tba tbb tbd tbo tbp tbr tbs tbt tda tdb tdd tdo tdp tdr tds tdt to- toa tob tod too top tor tos tot tpa tpb tpd tpo tpp tpr tps tpt tra trb trd tro trp trr trs trt tsa tsb tsd tso tsp tsr tss tst tta ttb ttd tto ttp ttr tts ttt