c-- ccc cce cck cco ccp cct ccv ce- cec cee cek ceo cep cet cev ckc cko ckt co- coc coe cok coo cop cot cov cpc cpe cpk cpo cpp cpt cpv ctc cte ctk cto ctp ctt ctv cvc cve cvk cvo cvp cvt cvv ec- ecc ece eck eco ect ecv eec eee eek eeo eep eet eev ekc eke eko ekp ekt ekv eo- eoc eoe eok eoo eop eot ep- epc epe epo epp ept etc ete etk eto etp ett etv evc eve evo evp evt evv k-t kcc kce kck kcp kct ke- kec kee kek keo kep ket kev kkc kke kkk kkp kkt kkv koc koe kok koo kop kot kpc kpe kpk kpo kpp kpt kpv ktc kte ktk kto ktp ktt ktv kvk kvo kvp kvv oc- occ ock oco ocp oct ocv oec oee oeo oep oet okc oke okk oko okp oo- ooc ook ooo oop oot oov op- opc ope opk opo opp opt opv ot- otc ote otk oto otp ott otv ov- ovc ove ovo ovp ovv p-p pcc pce pck pco pcp pct pcv pec pee pek peo pep pet pev pkc pke pko pkp pkt poc poe pok poo pop pot pov ppc ppe ppk ppo ppp ppt ppv pt- ptc pte ptk pto ptp ptt ptv pvc pve pvk pvo pvp pvt pvv tcc tce tck tco tcp tct tcv te- tec tee tek teo tep tet tev tkc tke tkk tko tkp tkt to- toc toe tok too top tot tov tpc tpe tpk tpo tpp tpt tpv ttc tte ttk tto ttp ttt ttv tvc tve tvk tvo tvp tvt v-e vcc vce vco vcp vct vec vee vek veo vep vet vkp vkt voc voe vok voo vop vot vov vpc vpe vpk vpo vpp vpt vtc vte vtk vto vtt vtv vvc vvo vvt vvv