-ey c-- ccc cce ccn cco ccx ce- cec cee cen ceo cex cey cn- cnc cne cnn cno cnx cny co- coc coe con coo cox coy cxc cxo cxx cyc cye cyn cyo ec- ecc ece ecn eco ecx eec eee een eeo eex eey en- enc ene enn eno eny eo- eoc eoe eon eoo ex- exc exe exo exx exy eyc eye eyn eyo ncc nce ncn nco ncx ne- nec nee nen neo nex ney nnc nne nnn nno no- noc noe non noo nox noy nxc nyc nye nyn nyo nyx nyy oc- occ ocn oco ocx oec oee oen oeo oex oey on- onc one onn ono onx ony oo- ooc oon ooo oox ox- oxc oxn oxo oxx oxy oye oyo xcx xee xen xex xnc xno xoc xon xoo xox xxo xxx xxy xyy ycc yce yco ycy yec yee yen yeo yex yey yne ynn yny yoc yoe yon yoo yox yoy yxe yxy yyc yye yyy