c-- ccc ccd cce cck ccn ccs cdc cdd cde cdk cdn cds ce- cec ced cee cek cen ces ckc ckd cks cn- cnc cnd cne cnn cns csc csd cse csk csn css dcc dcd dce dck dcn dcs ddc ddd dde ddk ddn dds de- dec ded dee dek den des dkc dke dkk dks dnc dnd dne dnk dnn dns dsc dsd dse dsk dsn dss ec- ecc ecd ece eck ecn ecs ed- edc edd ede edk edn eds eec eed eee eek een ees ekc ekd eke eks en- enc end ene enk enn ens es- esc esd ese esk esn ess kcc kcd kce kck kcn kcs kdc kde kdk kds ke- kec ked kee kek ken kes kkc kke kkk kkn kks kn- knc knd kne knk knn ksc ksd kse ksk ksn kss ncc ncd nce nck ncn ncs ndc ndd nde ndk ndn nds ne- nec ned nee nek nen nes nkc nke nkk nkn nks nnc nne nnk nnn nns nsc nsd nse nsk nsn nss scc scd sce sck scn scs sdc sdd sde sdk sdn sds se- sec sed see sek sen ses sk- skc skd ske skk sks snc snd sne snk snn sns ss- ssc ssd sse ssk ssn sss