cccc ccnc ccnr ccoc ccrc cnco cnrc cnrr coco con- conc conn cono coon cor- corc corn coro corr crcc crcr croc cron croo cror nccc nccn nccr ncnc ncoc ncor ncrc ncrq nnnn noco non- nonn nono noo- noon nooo noor nor- norc norn noro norr nroc nron nrrc occc occn ocon ocro ocrr onc- onco onno onon onor oocr oooo orco ornc orno oro- oron oror orro qqqq rccc rcnr rcon rnco rocc roco ronc rono roon roor rorc roro rrrr