cccc cccf cccl cccu ccfc ccff ccfl cclc ccnc ccnf ccnr ccnu ccoc ccrc ccrf ccrl ccuc cfcf cfcl cfcn cfco cffr cfln cfnr cfor cfrn cfun clof clon cloo clor clou clro clun cnco cnrc cnrr coco cocu cofc coff col- coll coln colo colu con- conc conf conn cono coof cool coon cor- corc corf corl corn coro corr coul coun cour crcc crcr crfc crfl crlf croc crol cron croo cror crun cucc cucn cufc cuff cufo culc cull culo cuno cuon curf curl curn curo curr fccf fcnl ffcc ffff ffrr ffun flcl flnc floc flon floo flor flou fluf fluo flur fnlc fnuf foco fofo folc foll folo folr fono foof fool foon for- forl forn foro forr foul foun four frcc frcn frfc frol fron frou frun fuc- fufc fuff fufu full fulu funf fuor fur- furl furn furo furr lccc lcfc lcfr lcor lcrl lfcc llcc lllc llll lloc lloo lncr locc locn loco locu loff lofn loll lolo lono lonr looc loof lool loon loor lorn loro loul loun lour louu lrfc lroc lron lrrc lrrr luff lufu lull lulu lunn luno nccc nccf nccn nccr nccu ncfc nclc ncln nclr ncnc ncoc ncor ncrc nfcu nfff nfon nlcc nlcf nnnn nocl noco nolf noll nolo non- nonn nono nonu noo- nool noon nooo noor nor- norc norf norn noro norr noul noun nour nrfc nroc nron nrrc nrrl nucu nuff null nunc nunn nuno nuoc nuon nurc nurl nurn nurr nuru occc occn oclc ocon ocrl ocro ocrr ocul ocur ofcl ofcr off- offc offo offr offu ofno ofor olcc ollo olof olon olor olur onc- oncf onco onlf onno onon onor onur oocr ooff oolo oooo orco orff orfu orlo orlu ornc orno oro- orof oron oror orro oucc oufc ouff oulu oun- our- ourn ouro ouu- rccc rcfc rcnl rcnr rcon rffc rffl rnco rocc roco rofc roff rofl rofo rolf roll rolo ronc rono roof rool roon roor rorc roro roru rouf roul roun rrfc rrrr rrun rufc ruff rufo rull rulo runc runf runn runo rurc ruro ruru ruun ucon ucrc ufcu ulcc ulco ullo ullr ulno ulo- uloc ulul uncc uncf uncl unco unlf unno unon unrf unro uocc uofl uofo uolc uor- urff uro- urol uroo urun urur uulu uuno uuoc uuuu