a-a a-b a-t aaa aab aae aan aao aap aas aat ab- aba abb abe abn abo abp abs abt aea aeb aee aen aeo aep aes aet an- ana anb ane ann ano anp ans ant aoa aob aoe aon aoo aop aos aot ap- apa apb ape apn apo app aps apt as- asa asb ase asn aso asp ass ast at- ata atb ate atn ato atp ats att b-p baa bab bae ban bao bap bas bat bba bbb bbe bbn bbo bbp bbs bbt be- bea beb bee ben beo bep bes bet bna bnb bne bnn bno bnp bns bnt boa bob boe bon boo bop bos bot bpa bpb bpe bpn bpo bpp bps bpt bsa bsb bse bsn bso bsp bss bst bta btb bte btn bto btp bts btt eaa eab eae ean eao eap eas eat eba ebb ebe ebn ebo ebp ebs ebt eea eeb eee een eeo eep ees eet en- ena enb ene enn eno enp ens ent eo- eoa eob eoe eon eoo eop eos eot ep- epa epb epe epn epo epp eps ept es- esa esb ese esn eso esp ess est eta etb ete etn eto etp ets ett naa nab nae nan nao nap nas nat nba nbb nbe nbn nbo nbp nbs nbt ne- nea neb nee nen neo nep nes net nna nnb nne nnn nno nnp nns nnt no- noa nob noe non noo nop nos not npa npb npe npn npo npp nps npt nsa nsb nse nsn nso nsp nss nst nta ntb nte ntn nto ntp nts ntt oaa oab oae oan oao oap oas oat ob- oba obb obe obn obo obp obs obt oea oeb oee oen oeo oep oes oet on- ona onb one onn ono onp ons ont oo- ooa oob oon ooo oop oos oot op- opa opb ope opn opo opp ops opt os- osa osb ose osn oso osp oss ost ot- ota otb ote otn oto otp ots ott p-p paa pab pae pan pao pap pas pat pba pbb pbe pbn pbo pbp pbs pbt pea peb pee pen peo pep pes pet pn- pna pnb pne pnn pno pnp pns pnt poa pob poe pon poo pop pos pot ppa ppb ppe ppn ppo ppp pps ppt ps- psa psb pse psn pso psp pss pst pt- pta ptb pte ptn pto ptp pts ptt saa sab sae san sao sap sas sat sba sbb sbe sbn sbo sbp sbs sbt se- sea seb see sen seo sep ses set sna snb sne snn sno snp sns snt soa sob soe son soo sop sos sot spa spb spe spn spo spp sps spt ss- ssa ssb sse ssn sso ssp sss sst sta stb ste stn sto stp sts stt taa tab tae tan tao tap tas tat tba tbb tbe tbn tbo tbp tbs tbt te- tea teb tee ten teo tep tes tet tna tnb tne tnn tno tnp tns tnt to- toa tob toe ton too top tos tot tpa tpb tpe tpn tpo tpp tps tpt tsa tsb tse tsn tso tsp tss tst tta ttb tte ttn tto ttp tts ttt