-er c-- ccc cce cck ccn cco ccr ccs ccu ce- cec cee cek cen ceo cer ces ceu ckc cko cks cn- cnc cne cnn cno cnr cns cnu co- coc coe cok con coo cor cos cou crc cre crk crn cro crr crs cru csc cse csk csn cso csr css csu cuc cue cuk cun cuo cur cus cuu ec- ecc ece eck ecn eco ecr ecs ecu eec eee eek een eeo eer ees ekc eke eko ekr eks eku en- enc ene enk enn eno enr ens enu eo- eoc eoe eok eon eoo eor eos eou erc ere erk ern ero err ers eru es- esc ese esk esn eso esr ess esu eu- euc eue eun eur eus kcc kce kck kcn kcr kcs kcu ke- kec kee kek ken keo ker kes kkc kke kkk kkn kkr kks kku kn- knc kne knk knn kno knr knu koc koe kok kon koo kor kos kou krc krk krn kro krr krs kru ksc kse ksk ksn kso ksr kss ksu kuc kue kuk kun kur kus kuu ncc nce nck ncn nco ncr ncs ncu ne- nec nee nek nen neo ner nes neu nkc nke nkk nkn nko nkr nks nku nnc nne nnk nnn nno nns nnu no- noc noe nok non noo nor nos nou nrc nre nrk nrn nro nrr nrs nru nsc nse nsk nsn nso nsr nss nsu nuc nue nuk nun nuo nur nus nuu oc- occ ock ocn oco ocr ocs ocu oec oee oen oeo oer oes okc oke okk oko okr oks oku on- onc one onk onn ono onr ons onu oo- ooc ook oon ooo oor oos or- orc ore ork orn oro orr ors oru os- osc ose osk osn oso osr oss osu ou- ouc oue ouk oun ouo our ous rcc rce rcn rco rcr rcs rcu re- rec ree rek ren reo rer res reu rkc rke rkk rko rks rku rnc rnn rno rnr rns rnu roc roe rok ron roo ror ros rou rrc rrk rrn rrr rrs rru rsc rse rsk rsn rso rsr rss rsu ruc rue ruk run ruo rur rus ruu scc sce sck scn sco scr scs scu se- sec see sek sen seo ser ses seu sk- skc ske skk sko skr sks sku snc sne snk snn sno snr sns snu soc soe sok son soo sor sos sou sr- src sre srk srn sro srr srs ss- ssc sse ssk ssn sso ssr sss ssu suc sue suk sun suo sur sus suu ucc uce uck ucn uco ucr ucs ucu uec uee uen uer ues ukc uke ukk ukn ukr uku un- unc une unk unn uno unr uns unu uoc uoe uok uon uoo uor uos ur- urc ure urk urn uro urr urs uru usc use usk usn uso usr uss usu uuc uue uun uur uus uuu