a-a a-b a-t aaa aab aad aan aao aap aas aat ab- aba abb abd abn abo abp abs abt ad- ada adb add adn ado adp ads adt an- ana anb and ann ano anp ans ant aoa aob aod aon aoo aop aos aot ap- apa apb apd apn apo app aps apt as- asa asb asd asn aso asp ass ast at- ata atb atd atn ato atp ats att b-p baa bab bad ban bao bap bas bat bba bbb bbd bbn bbo bbp bbs bbt bda bdb bdd bdo bdp bds bdt bna bnb bnd bnn bno bnp bns bnt boa bob bod bon boo bop bos bot bpa bpb bpd bpn bpo bpp bps bpt bsa bsb bsd bsn bso bsp bss bst bta btb btd btn bto btp bts btt daa dab dad dan dao dap das dat dba dbb dbd dbn dbo dbp dbs dbt dda ddb ddd ddn ddo ddp dds ddt dna dnb dnd dnn dno dnp dns dnt doa dob dod don doo dop dos dot dpa dpb dpd dpn dpo dpp dps dpt dsa dsb dsd dsn dso dsp dss dst dta dtb dtd dtn dto dtp dts dtt naa nab nad nan nao nap nas nat nba nbb nbd nbn nbo nbp nbs nbt nda ndb ndd ndn ndo ndp nds ndt nna nnb nnn nno nnp nns nnt no- noa nob nod non noo nop nos not npa npb npd npn npo npp nps npt nsa nsb nsd nsn nso nsp nss nst nta ntb ntd ntn nto ntp nts ntt oaa oab oad oan oao oap oas oat ob- oba obb obd obn obo obp obs obt oda odb odd odn odo odp ods odt on- ona onb ond onn ono onp ons ont oo- ooa oob ood oon ooo oop oos oot op- opa opb opd opn opo opp ops opt os- osa osb osd osn oso osp oss ost ot- ota otb otd otn oto otp ots ott p-p paa pab pad pan pao pap pas pat pba pbb pbd pbn pbo pbp pbs pbt pda pdb pdd pdn pdo pdp pds pdt pn- pna pnb pnd pnn pno pnp pns pnt poa pob pod pon poo pop pos pot ppa ppb ppd ppn ppo ppp pps ppt ps- psa psb psd psn pso psp pss pst pt- pta ptb ptd ptn pto ptp pts ptt saa sab sad san sao sap sas sat sba sbb sbd sbn sbo sbp sbs sbt sda sdb sdd sdn sdo sdp sds sdt sna snb snd snn sno snp sns snt soa sob sod son soo sop sos sot spa spb spd spn spo spp sps spt ss- ssa ssb ssd ssn sso ssp sss sst sta stb std stn sto stp sts stt taa tab tad tan tao tap tas tat tba tbb tbd tbn tbo tbp tbs tbt tda tdb tdd tdn tdo tdp tds tdt tna tnb tnd tnn tno tnp tns tnt to- toa tob tod ton too top tos tot tpa tpb tpd tpn tpo tpp tps tpt tsa tsb tsd tsn tso tsp tss tst tta ttb ttd ttn tto ttp tts ttt