c-- ccc ccd cce cck ccn cco ccp cdc cdd cde cdk cdn cdo cdp ce- cec ced cee cek cen ceo cep ckc ckd cko cn- cnc cnd cne cnn cno cnp co- coc cod coe cok con coo cop cpc cpd cpe cpk cpn cpo cpp dcc dcd dce dck dcn dco dcp ddc ddd dde ddk ddn ddo ddp de- dec ded dee dek den deo dep dkc dke dkk dko dkp dnc dnd dne dnk dnn dno dnp doc dod doe dok don doo dop dpc dpd dpe dpk dpn dpo dpp ec- ecc ecd ece eck ecn eco ed- edc edd ede edk edn edo edp eec eed eee eek een eeo eep ekc ekd eke eko ekp en- enc end ene enk enn eno enp eo- eoc eod eoe eok eon eoo eop ep- epc epd epe epn epo epp kcc kcd kce kck kcn kcp kdc kde kdk kdo kdp ke- kec ked kee kek ken keo kep kkc kke kkk kkn kkp kn- knc knd kne knk knn kno knp koc kod koe kok kon koo kop kpc kpd kpe kpk kpn kpo kpp ncc ncd nce nck ncn nco ncp ndc ndd nde ndk ndn ndo ndp ne- nec ned nee nek nen neo nep nkc nke nkk nkn nko nkp nnc nne nnk nnn nno nnp no- noc nod noe nok non noo nop npc npd npe npn npo npp oc- occ ocd ock ocn oco ocp odc odd ode odn odo odp oec oed oee oen oeo oep okc okd oke okk oko okp on- onc ond one onk onn ono onp oo- ooc ood ook oon ooo oop op- opc opd ope opk opn opo opp p-p pcc pcd pce pck pcn pco pcp pdc pdd pde pdk pdn pdo pdp pec ped pee pek pen peo pep pkc pkd pke pkn pko pkp pn- pnc pnd pne pnk pnn pno pnp poc pod poe pok pon poo pop ppc ppd ppe ppk ppn ppo ppp