c-- ccc cce cco ccs ccx ce- cec cee ceo ces cex co- coc coe coo cos cox csc cse cso css csx cxc cxo cxs cxx ec- ecc ece eco ecs ecx eec eee eeo ees eex eo- eoc eoe eoo eos es- esc ese eso ess esx ex- exc exe exo exs exx oc- occ oco ocs ocx oec oee oeo oes oex oo- ooc ooo oos oox os- osc ose oso oss osx ox- oxc oxo oxx scc sce sco scs scx se- sec see seo ses sex soc soe soo sos sox ss- ssc sse sso sss ssx sxc sxs xcx xee xes xex xoc xoo xos xox xsc xss xxo xxx