a-a a-c a-t aaa aac aae aan aao aap aat ac- aca acc ace acn aco acp act aea aec aee aen aeo aep aet an- ana anc ane ann ano anp ant aoa aoc aoe aon aoo aop aot ap- apa apc ape apn apo app apt at- ata atc ate atn ato atp att c-- caa cac cae can cao cap cat cca ccc cce ccn cco ccp cct ce- cea cec cee cen ceo cep cet cn- cna cnc cne cnn cno cnp cnt co- coa coc coe con coo cop cot cpa cpc cpe cpn cpo cpp cpt cta ctc cte ctn cto ctp ctt eaa eac eae ean eao eap eat ec- eca ecc ece ecn eco ect eea eec eee een eeo eep eet en- ena enc ene enn eno enp ent eo- eoa eoc eoe eon eoo eop eot ep- epa epc epe epn epo epp ept eta etc ete etn eto etp ett naa nac nae nan nao nap nat nca ncc nce ncn nco ncp nct ne- nea nec nee nen neo nep net nna nnc nne nnn nno nnp nnt no- noa noc noe non noo nop not npa npc npe npn npo npp npt nta ntc nte ntn nto ntp ntt oaa oac oae oan oao oap oat oc- oca occ ocn oco ocp oct oea oec oee oen oeo oep oet on- ona onc one onn ono onp ont oo- ooa ooc oon ooo oop oot op- opa opc ope opn opo opp opt ot- ota otc ote otn oto otp ott p-p paa pac pae pan pao pap pat pca pcc pce pcn pco pcp pct pea pec pee pen peo pep pet pn- pna pnc pne pnn pno pnp pnt poa poc poe pon poo pop pot ppa ppc ppe ppn ppo ppp ppt pt- pta ptc pte ptn pto ptp ptt taa tac tae tan tao tap tat tca tcc tce tcn tco tcp tct te- tea tec tee ten teo tep tet tna tnc tne tnn tno tnp tnt to- toa toc toe ton too top tot tpa tpc tpe tpn tpo tpp tpt tta ttc tte ttn tto ttp ttt