a-a a-b aaa aab aad aae aan aao aap ab- aba abb abd abe abn abo abp ad- ada adb add ade adn ado adp aea aeb aed aee aen aeo aep an- ana anb and ane ann ano anp aoa aob aod aoe aon aoo aop ap- apa apb apd ape apn apo app b-p baa bab bad bae ban bao bap bba bbb bbd bbe bbn bbo bbp bda bdb bdd bde bdo bdp be- bea beb bed bee ben beo bep bna bnb bnd bne bnn bno bnp boa bob bod boe bon boo bop bpa bpb bpd bpe bpn bpo bpp daa dab dad dae dan dao dap dba dbb dbd dbe dbn dbo dbp dda ddb ddd dde ddn ddo ddp de- dea deb ded dee den deo dep dna dnb dnd dne dnn dno dnp doa dob dod doe don doo dop dpa dpb dpd dpe dpn dpo dpp eaa eab ead eae ean eao eap eba ebb ebd ebe ebn ebo ebp ed- eda edb edd ede edn edo edp eea eeb eed eee een eeo eep en- ena enb end ene enn eno enp eo- eoa eob eod eoe eon eoo eop ep- epa epb epd epe epn epo epp naa nab nad nae nan nao nap nba nbb nbd nbe nbn nbo nbp nda ndb ndd nde ndn ndo ndp ne- nea neb ned nee nen neo nep nna nnb nne nnn nno nnp no- noa nob nod noe non noo nop npa npb npd npe npn npo npp oaa oab oad oae oan oao oap ob- oba obb obd obe obn obo obp oda odb odd ode odn odo odp oea oeb oed oee oen oeo oep on- ona onb ond one onn ono onp oo- ooa oob ood oon ooo oop op- opa opb opd ope opn opo opp p-p paa pab pad pae pan pao pap pba pbb pbd pbe pbn pbo pbp pda pdb pdd pde pdn pdo pdp pea peb ped pee pen peo pep pn- pna pnb pnd pne pnn pno pnp poa pob pod poe pon poo pop ppa ppb ppd ppe ppn ppo ppp