c-- ccc cce ccf ccn ccs ce- cec cee cef cen ces cfc cfe cff cfn cfs cn- cnc cne cnf cnn cns csc cse csf csn css ec- ecc ece ecf ecn ecs eec eee eef een ees ef- efc efe eff efs en- enc ene enf enn ens es- esc ese esf esn ess fcc fce fcf fcn fcs fec fee fef fen fes ffc ffe fff ffn ffs fnc fne fnf fnn fns fsc fse fsf fsn fss ncc nce ncf ncn ncs ne- nec nee nef nen nes nfc nfe nff nfn nfs nnc nne nnf nnn nns nsc nse nsf nsn nss scc sce scf scn scs se- sec see sef sen ses sfc sfe sff sfn sfs snc sne snf snn sns ss- ssc sse ssf ssn sss