c-- ccc ccd cce cck ccn cco cdc cdd cde cdk cdn cdo ce- cec ced cee cek cen ceo ckc ckd cko cn- cnc cnd cne cnn cno co- coc cod coe cok con coo dcc dcd dce dck dcn dco ddc ddd dde ddk ddn ddo de- dec ded dee dek den deo dkc dke dkk dko dnc dnd dne dnk dnn dno doc dod doe dok don doo ec- ecc ecd ece eck ecn eco ed- edc edd ede edk edn edo eec eed eee eek een eeo ekc ekd eke eko en- enc end ene enk enn eno eo- eoc eod eoe eok eon eoo kcc kcd kce kck kcn kdc kde kdk kdo ke- kec ked kee kek ken keo kkc kke kkk kkn kn- knc knd kne knk knn kno koc kod koe kok kon koo ncc ncd nce nck ncn nco ndc ndd nde ndk ndn ndo ne- nec ned nee nek nen neo nkc nke nkk nkn nko nnc nne nnk nnn nno no- noc nod noe nok non noo oc- occ ocd ock ocn oco odc odd ode odn odo oec oed oee oen oeo okc okd oke okk oko on- onc ond one onk onn ono oo- ooc ood ook oon ooo