-er c-- ccc ccd cce cck ccl ccr ccu cdc cdd cde cdk cdl cdr cdu ce- cec ced cee cek cel cer ceu ckc ckd cl- clc cld cle clk cll clr clu crc crd cre crk crl crr cru cuc cud cue cuk cul cur cuu dcc dcd dce dck dcl dcr dcu ddc ddd dde ddk ddl ddr ddu de- dec ded dee dek del der deu dkc dke dkk dkl dkr dku dl- dlc dld dle dlk dll dlr dlu drc drd dre drk drl drr dru duc dud due duk dul dur ec- ecc ecd ece eck ecl ecr ecu ed- edc edd ede edk edl edr edu eec eed eee eek eel eer ekc ekd eke ekl ekr eku elc eld ele elk ell elr elu erc erd ere erk erl err eru eu- euc eud eue eul eur kcc kcd kce kck kcl kcr kcu kdc kde kdk kdl kdr kdu ke- kec ked kee kek kel ker kkc kke kkk kkl kkr kku kl- klc kld klr klu krc krd krk krl krr kru kuc kud kue kuk kul kur kuu lcc lcd lce lck lcl lcr lcu ldc ldd lde ldk ldl ldr ldu lec led lee lek lel ler leu lkl lkr llc lld lle llk lll llr llu lrc lrd lrk lrr lru luc lud lue luk lul lur luu rcc rcd rce rcl rcr rcu rdc rdd rde rdl rdr rdu re- rec red ree rek rel rer reu rkc rke rkk rku rlc rld rle rll rlr rlu rrc rrd rrk rrl rrr rru ruc rud rue ruk rur ruu ucc ucd uce uck ucl ucr ucu udc udd ude udk udl udr udu uec ued uee uel uer ukc uke ukk ukl ukr uku ulc uld ule ulk ull ulr ulu ur- urc urd ure urk url urr uru uuc uue uur uuu