c-cd cccc cccf ccdc ccdf ccdn ccfc ccfd ccff ccnc ccnf ccoc ccod cdnc cdnf cdon cfcf cfcn cfco cnco cndd coco codd cofc coff con- conc cond conf conn cono cood coof coon dccc dcfc dcon dddd ddoc dfcc dfco dnoc doco dod- dodd dodo doff donc dond donn dono dood doof doon fccf fdoc ffcc ffff fndd fndn foco fofo fond fono food foof foon nccc nccf nccn ncdc ncdn ncfc ncnc ncnd ncoc ndcc nddo ndoc nfdc nfff nfon nnnn noco nodo non- nonn nono noo- noon nooo occc occn ocon oddd odon odoo off- offc offo ofno onc- oncd oncf onco ondo onno onod onon ooff oooo