a-a a-c a-t aaa aac aae aak aan aao aap aat ac- aca acc ace ack acn aco acp act aea aec aee aek aen aeo aep aet aka akc ake akk akn ako akp an- ana anc ane ank ann ano anp ant aoa aoc aoe aok aon aoo aop aot ap- apa apc ape apk apn apo app apt at- ata atc ate atn ato atp att c-- caa cac cae cak can cao cap cat cca ccc cce cck ccn cco ccp cct ce- cea cec cee cek cen ceo cep cet cka ckc cko ckt cn- cna cnc cne cnn cno cnp cnt co- coa coc coe cok con coo cop cot cpa cpc cpe cpk cpn cpo cpp cpt cta ctc cte ctk ctn cto ctp ctt eaa eac eae eak ean eao eap eat ec- eca ecc ece eck ecn eco ect eea eec eee eek een eeo eep eet eka ekc eke eko ekp ekt en- ena enc ene enk enn eno enp ent eo- eoa eoc eoe eok eon eoo eop eot ep- epa epc epe epn epo epp ept eta etc ete etk etn eto etp ett k-t ka- kaa kac kae kak kan kao kap kat kca kcc kce kck kcn kcp kct ke- kea kec kee kek ken keo kep ket kkc kke kkk kkn kkp kkt kn- kna knc kne knk knn kno knp knt koa koc koe kok kon koo kop kot kpa kpc kpe kpk kpn kpo kpp kpt kta ktc kte ktk ktn kto ktp ktt naa nac nae nak nan nao nap nat nca ncc nce nck ncn nco ncp nct ne- nea nec nee nek nen neo nep net nka nkc nke nkk nkn nko nkp nkt nna nnc nne nnk nnn nno nnp nnt no- noa noc noe nok non noo nop not npa npc npe npn npo npp npt nta ntc nte ntk ntn nto ntp ntt oaa oac oae oak oan oao oap oat oc- oca occ ock ocn oco ocp oct oea oec oee oen oeo oep oet oka okc oke okk oko okp on- ona onc one onk onn ono onp ont oo- ooa ooc ook oon ooo oop oot op- opa opc ope opk opn opo opp opt ot- ota otc ote otk otn oto otp ott p-p paa pac pae pak pan pao pap pat pca pcc pce pck pcn pco pcp pct pea pec pee pek pen peo pep pet pka pkc pke pkn pko pkp pkt pn- pna pnc pne pnk pnn pno pnp pnt poa poc poe pok pon poo pop pot ppa ppc ppe ppk ppn ppo ppp ppt pt- pta ptc pte ptk ptn pto ptp ptt taa tac tae tak tan tao tap tat tca tcc tce tck tcn tco tcp tct te- tea tec tee tek ten teo tep tet tka tkc tke tkk tko tkp tkt tna tnc tne tnk tnn tno tnp tnt to- toa toc toe tok ton too top tot tpa tpc tpe tpk tpn tpo tpp tpt tta ttc tte ttk ttn tto ttp ttt