a-a a-c a-t aaa aac aan aao aap aat ac- aca acc acn aco acp act an- ana anc ann ano anp ant aoa aoc aon aoo aop aot ap- apa apc apn apo app apt at- ata atc atn ato atp att c-- caa cac can cao cap cat cca ccc ccn cco ccp cct cn- cna cnc cnn cno cnp cnt co- coa coc con coo cop cot cpa cpc cpn cpo cpp cpt cta ctc ctn cto ctp ctt naa nac nan nao nap nat nca ncc ncn nco ncp nct nna nnc nnn nno nnp nnt no- noa noc non noo nop not npa npc npn npo npp npt nta ntc ntn nto ntp ntt oaa oac oan oao oap oat oc- oca occ ocn oco ocp oct on- ona onc onn ono onp ont oo- ooa ooc oon ooo oop oot op- opa opc opn opo opp opt ot- ota otc otn oto otp ott p-p paa pac pan pao pap pat pca pcc pcn pco pcp pct pn- pna pnc pnn pno pnp pnt poa poc pon poo pop pot ppa ppc ppn ppo ppp ppt pt- pta ptc ptn pto ptp ptt taa tac tan tao tap tat tca tcc tcn tco tcp tct tna tnc tnn tno tnp tnt to- toa toc ton too top tot tpa tpc tpn tpo tpp tpt tta ttc ttn tto ttp ttt