a-a a-b aaa aab aad aae aan aap ab- aba abb abd abe abn abp ad- ada adb add ade adn adp aea aeb aed aee aen aep an- ana anb and ane ann anp ap- apa apb apd ape apn app b-p baa bab bad bae ban bap bba bbb bbd bbe bbn bbp bda bdb bdd bde bdp be- bea beb bed bee ben bep bna bnb bnd bne bnn bnp bpa bpb bpd bpe bpn bpp daa dab dad dae dan dap dba dbb dbd dbe dbn dbp dda ddb ddd dde ddn ddp de- dea deb ded dee den dep dna dnb dnd dne dnn dnp dpa dpb dpd dpe dpn dpp eaa eab ead eae ean eap eba ebb ebd ebe ebn ebp ed- eda edb edd ede edn edp eea eeb eed eee een eep en- ena enb end ene enn enp ep- epa epb epd epe epn epp naa nab nad nae nan nap nba nbb nbd nbe nbn nbp nda ndb ndd nde ndn ndp ne- nea neb ned nee nen nep nna nnb nne nnn nnp npa npb npd npe npn npp p-p paa pab pad pae pan pap pba pbb pbd pbe pbn pbp pda pdb pdd pde pdn pdp pea peb ped pee pen pep pn- pna pnb pnd pne pnn pnp ppa ppb ppd ppe ppn ppp