-ene cccc cccf cccv ccee ccfc ccff ccnc ccne ccnf ccnr ccrc ccre ccrf cec- cece ceec cef- cefc cefn cen- cene cer- cerc cere cerf cern cfcf cfcn cffr cfnr cfre cfrn cnrc cnrr crcc crce crcr cre- crec cree cren crfc crne cvcc cven cver cvfr cvrr eccc ecce ecef ecfc ecfr ecne ecrc ecrf ecrr ecrv eeee eefe eefn eerc eevn efen en-v ence enee ener ennc enne ercc erce erec eren erer erev erfc erne errc erre erve even ever evre fccf fece feen feer fefc fefe feff fene fenn ferc fere fern ferr ferv feve fevr ffcc ffee ffff ffrr fr-v frcc frcn free fren frfc nccc nccf nccn nccr ncec ncee ncef ncen ncer ncfc ncfe ncnc ncrc ncre necc nece necr neef neen neer neev nefe neff nene nerc nere nerf nerr nerv neve nfer nfff nnnn nren nrfc nrrc nvcc nvfc nvfr rccc rcfc rcnr rcvr recc rece recr reef reen reev refe reff refn refr rene renn rere reve rfef rffc rrfc rrrr rv-c rver vecc veen veer ven- vene venn ver- vere vern veve vfcc vref vrnn vver vvvv