a-a a-b a-t aaa aab aae aaf aan aap aat ab- aba abb abe abf abn abp abt aea aeb aee aef aen aep aet af- afa afb afe aff afn afp aft an- ana anb ane anf ann anp ant ap- apa apb ape apf apn app apt at- ata atb ate atf atn atp att b-p baa bab bae baf ban bap bat bba bbb bbe bbf bbn bbp bbt be- bea beb bee bef ben bep bet bfa bfb bfe bff bfn bfp bft bna bnb bne bnf bnn bnp bnt bpa bpb bpe bpf bpn bpp bpt bta btb bte btf btn btp btt eaa eab eae eaf ean eap eat eba ebb ebe ebf ebn ebp ebt eea eeb eee eef een eep eet ef- efa efb efe eff efp eft en- ena enb ene enf enn enp ent ep- epa epb epe epf epn epp ept eta etb ete etf etn etp ett faa fab fae faf fan fap fat fba fbb fbe fbf fbn fbp fbt fea feb fee fef fen fep fet ffa ffe fff ffn ffp fft fna fnb fne fnf fnn fnp fnt fpa fpb fpe fpn fpp fpt fta ftb fte ftf ftn ftp ftt naa nab nae naf nan nap nat nba nbb nbe nbf nbn nbp nbt ne- nea neb nee nef nen nep net nfa nfb nfe nff nfn nfp nft nna nnb nne nnf nnn nnp nnt npa npb npe npf npn npp npt nta ntb nte ntf ntn ntp ntt p-p paa pab pae paf pan pap pat pba pbb pbe pbf pbn pbp pbt pea peb pee pef pen pep pet pfa pfb pfe pff pfn pfp pft pn- pna pnb pne pnf pnn pnp pnt ppa ppb ppe ppf ppn ppp ppt pt- pta ptb pte ptf ptn ptp ptt taa tab tae taf tan tap tat tba tbb tbe tbf tbn tbp tbt te- tea teb tee tef ten tep tet tfa tfb tfe tff tfn tfp tft tna tnb tne tnf tnn tnp tnt tpa tpb tpe tpf tpn tpp tpt tta ttb tte ttf ttn ttp ttt