-er c-- ccc ccd cce ccr ccu ccz cdc cdd cde cdr cdu cdz ce- cec ced cee cer ceu cez crc crd cre crr cru crz cuc cud cue cur cuu cuz cz- czc czd cze dcc dcd dce dcr dcu ddc ddd dde ddr ddu ddz de- dec ded dee der deu dez drc drd dre drr dru drz duc dud due dur duz dzd dze dzr dzu ec- ecc ecd ece ecr ecu ed- edc edd ede edr edu eec eed eee eer erc erd ere err eru erz eu- euc eud eue eur eze ezr ezz rcc rcd rce rcr rcu rdc rdd rde rdr rdu re- rec red ree rer reu rez rrc rrd rrr rru ruc rud rue rur ruu ruz rze ucc ucd uce ucr ucu udc udd ude udr udu uec ued uee uer ur- urc urd ure urr uru urz uuc uue uur uuu uzu zce zec zed zee zer zez zuc zud zur zuz zzr zzz