a-a a-b a-t aaa aab aad aae aao aap aas aat ab- aba abb abd abe abo abp abs abt ad- ada adb add ade ado adp ads adt aea aeb aed aee aeo aep aes aet aoa aob aod aoe aoo aop aos aot ap- apa apb apd ape apo app aps apt as- asa asb asd ase aso asp ass ast at- ata atb atd ate ato atp ats att b-p baa bab bad bae bao bap bas bat bba bbb bbd bbe bbo bbp bbs bbt bda bdb bdd bde bdo bdp bds bdt be- bea beb bed bee beo bep bes bet boa bob bod boe boo bop bos bot bpa bpb bpd bpe bpo bpp bps bpt bsa bsb bsd bse bso bsp bss bst bta btb btd bte bto btp bts btt daa dab dad dae dao dap das dat dba dbb dbd dbe dbo dbp dbs dbt dda ddb ddd dde ddo ddp dds ddt de- dea deb ded dee deo dep des det doa dob dod doe doo dop dos dot dpa dpb dpd dpe dpo dpp dps dpt dsa dsb dsd dse dso dsp dss dst dta dtb dtd dte dto dtp dts dtt eaa eab ead eae eao eap eas eat eba ebb ebd ebe ebo ebp ebs ebt ed- eda edb edd ede edo edp eds edt eea eeb eed eee eeo eep ees eet eo- eoa eob eod eoe eoo eop eos eot ep- epa epb epd epe epo epp eps ept es- esa esb esd ese eso esp ess est eta etb etd ete eto etp ets ett oaa oab oad oae oao oap oas oat ob- oba obb obd obe obo obp obs obt oda odb odd ode odo odp ods odt oea oeb oed oee oeo oep oes oet oo- ooa oob ood ooo oop oos oot op- opa opb opd ope opo opp ops opt os- osa osb osd ose oso osp oss ost ot- ota otb otd ote oto otp ots ott p-p paa pab pad pae pao pap pas pat pba pbb pbd pbe pbo pbp pbs pbt pda pdb pdd pde pdo pdp pds pdt pea peb ped pee peo pep pes pet poa pob pod poe poo pop pos pot ppa ppb ppd ppe ppo ppp pps ppt ps- psa psb psd pse pso psp pss pst pt- pta ptb ptd pte pto ptp pts ptt saa sab sad sae sao sap sas sat sba sbb sbd sbe sbo sbp sbs sbt sda sdb sdd sde sdo sdp sds sdt se- sea seb sed see seo sep ses set soa sob sod soe soo sop sos sot spa spb spd spe spo spp sps spt ss- ssa ssb ssd sse sso ssp sss sst sta stb std ste sto stp sts stt taa tab tad tae tao tap tas tat tba tbb tbd tbe tbo tbp tbs tbt tda tdb tdd tde tdo tdp tds tdt te- tea teb ted tee teo tep tes tet to- toa tob tod toe too top tos tot tpa tpb tpd tpe tpo tpp tps tpt tsa tsb tsd tse tso tsp tss tst tta ttb ttd tte tto ttp tts ttt