c-- ccc cce ccg ccn cco ccx ce- cec cee ceg cen ceo cex cgc cge cgg cgn cgo cn- cnc cne cng cnn cno cnx co- coc coe cog con coo cox cxc cxo cxx ec- ecc ece ecg ecn eco ecx eec eee eeg een eeo eex egc ege egg egn ego egx en- enc ene eng enn eno eo- eoc eoe eog eon eoo ex- exc exe exo exx gcc gce gcg gcn gco ge- gec gee geg gen geo gex ggc ggg ggn ggo gnc gne gnn gno goc goe gog gon goo gox ncc nce ncg ncn nco ncx ne- nec nee neg nen neo nex ngc nge ngg ngn ngo nnc nne nng nnn nno no- noc noe nog non noo nox nxc oc- occ ocg ocn oco ocx oec oee oeg oen oeo oex ogc oge ogg ogn ogo ogx on- onc one ong onn ono onx oo- ooc oog oon ooo oox ox- oxc oxn oxo oxx xcx xee xeg xen xex xge xnc xno xoc xog xon xoo xox xxo xxx