c-- ccc cck ccn cco ccs ccx ckc cko cks ckx cn- cnc cnn cno cns cnx co- coc cok con coo cos cox csc csk csn cso css csx cxc cxk cxo cxs cxx kcc kck kcn kcs kcx kkc kkk kkn kks kn- knc knk knn kno knx koc kok kon koo kos ksc ksk ksn kso kss kxo ncc nck ncn nco ncs ncx nkc nkk nkn nko nks nnc nnk nnn nno nns no- noc nok non noo nos nox nsc nsk nsn nso nss nsx nxc oc- occ ock ocn oco ocs ocx okc okk oko oks on- onc onk onn ono ons onx oo- ooc ook oon ooo oos oox os- osc osk osn oso oss osx ox- oxc oxn oxo oxx scc sck scn sco scs scx sk- skc skk sko sks skx snc snk snn sno sns soc sok son soo sos sox ss- ssc ssk ssn sso sss ssx sxc sxn sxs xcx xks xnc xnk xno xns xoc xok xon xoo xos xox xsc xss xxo xxx