a-a a-b a-t aaa aab aae aan aap aas aat ab- aba abb abe abn abp abs abt aea aeb aee aen aep aes aet an- ana anb ane ann anp ans ant ap- apa apb ape apn app aps apt as- asa asb ase asn asp ass ast at- ata atb ate atn atp ats att b-p baa bab bae ban bap bas bat bba bbb bbe bbn bbp bbs bbt be- bea beb bee ben bep bes bet bna bnb bne bnn bnp bns bnt bpa bpb bpe bpn bpp bps bpt bsa bsb bse bsn bsp bss bst bta btb bte btn btp bts btt eaa eab eae ean eap eas eat eba ebb ebe ebn ebp ebs ebt eea eeb eee een eep ees eet en- ena enb ene enn enp ens ent ep- epa epb epe epn epp eps ept es- esa esb ese esn esp ess est eta etb ete etn etp ets ett naa nab nae nan nap nas nat nba nbb nbe nbn nbp nbs nbt ne- nea neb nee nen nep nes net nna nnb nne nnn nnp nns nnt npa npb npe npn npp nps npt nsa nsb nse nsn nsp nss nst nta ntb nte ntn ntp nts ntt p-p paa pab pae pan pap pas pat pba pbb pbe pbn pbp pbs pbt pea peb pee pen pep pes pet pn- pna pnb pne pnn pnp pns pnt ppa ppb ppe ppn ppp pps ppt ps- psa psb pse psn psp pss pst pt- pta ptb pte ptn ptp pts ptt saa sab sae san sap sas sat sba sbb sbe sbn sbp sbs sbt se- sea seb see sen sep ses set sna snb sne snn snp sns snt spa spb spe spn spp sps spt ss- ssa ssb sse ssn ssp sss sst sta stb ste stn stp sts stt taa tab tae tan tap tas tat tba tbb tbe tbn tbp tbs tbt te- tea teb tee ten tep tes tet tna tnb tne tnn tnp tns tnt tpa tpb tpe tpn tpp tps tpt tsa tsb tse tsn tsp tss tst tta ttb tte ttn ttp tts ttt