c-- ccc cce ccn cco ccp cct ce- cec cee cen ceo cep cet cn- cnc cne cnn cno cnp cnt co- coc coe con coo cop cot cpc cpe cpn cpo cpp cpt ctc cte ctn cto ctp ctt ec- ecc ece ecn eco ect eec eee een eeo eep eet en- enc ene enn eno enp ent eo- eoc eoe eon eoo eop eot ep- epc epe epn epo epp ept etc ete etn eto etp ett ncc nce ncn nco ncp nct ne- nec nee nen neo nep net nnc nne nnn nno nnp nnt no- noc noe non noo nop not npc npe npn npo npp npt ntc nte ntn nto ntp ntt oc- occ ocn oco ocp oct oec oee oen oeo oep oet on- onc one onn ono onp ont oo- ooc oon ooo oop oot op- opc ope opn opo opp opt ot- otc ote otn oto otp ott p-p pcc pce pcn pco pcp pct pec pee pen peo pep pet pn- pnc pne pnn pno pnp pnt poc poe pon poo pop pot ppc ppe ppn ppo ppp ppt pt- ptc pte ptn pto ptp ptt tcc tce tcn tco tcp tct te- tec tee ten teo tep tet tnc tne tnn tno tnp tnt to- toc toe ton too top tot tpc tpe tpn tpo tpp tpt ttc tte ttn tto ttp ttt