-er c-- ccc ccd cce ccl ccr ccu cdc cdd cde cdl cdr cdu ce- cec ced cee cel cer ceu cl- clc cld cle cll clr clu crc crd cre crl crr cru cuc cud cue cul cur cuu dcc dcd dce dcl dcr dcu ddc ddd dde ddl ddr ddu de- dec ded dee del der deu dl- dlc dld dle dll dlr dlu drc drd dre drl drr dru duc dud due dul dur ec- ecc ecd ece ecl ecr ecu ed- edc edd ede edl edr edu eec eed eee eel eer elc eld ele ell elr elu erc erd ere erl err eru eu- euc eud eue eul eur lcc lcd lce lcl lcr lcu ldc ldd lde ldl ldr ldu lec led lee lel ler leu llc lld lle lll llr llu lrc lrd lrr lru luc lud lue lul lur luu rcc rcd rce rcl rcr rcu rdc rdd rde rdl rdr rdu re- rec red ree rel rer reu rlc rld rle rll rlr rlu rrc rrd rrl rrr rru ruc rud rue rur ruu ucc ucd uce ucl ucr ucu udc udd ude udl udr udu uec ued uee uel uer ulc uld ule ull ulr ulu ur- urc urd ure url urr uru uuc uue uur uuu