-er c-- ccc ccd cce ccn ccr ccu cdc cdd cde cdn cdr cdu ce- cec ced cee cen cer ceu cn- cnc cnd cne cnn cnr cnu crc crd cre crn crr cru cuc cud cue cun cur cuu dcc dcd dce dcn dcr dcu ddc ddd dde ddn ddr ddu de- dec ded dee den der deu dnc dnd dne dnn dnr drc drd dre drn drr dru duc dud due dun dur ec- ecc ecd ece ecn ecr ecu ed- edc edd ede edn edr edu eec eed eee een eer en- enc end ene enn enr enu erc erd ere ern err eru eu- euc eud eue eun eur ncc ncd nce ncn ncr ncu ndc ndd nde ndn ndr ndu ne- nec ned nee nen ner neu nnc nne nnn nnu nrc nrd nre nrn nrr nru nuc nud nue nun nur nuu rcc rcd rce rcn rcr rcu rdc rdd rde rdn rdr rdu re- rec red ree ren rer reu rnc rnd rnn rnr rnu rrc rrd rrn rrr rru ruc rud rue run rur ruu ucc ucd uce ucn ucr ucu udc udd ude udn udr udu uec ued uee uen uer un- unc und une unn unr unu ur- urc urd ure urn urr uru uuc uue uun uur uuu