-er c-- ccc cce ccr cct ccu ccx ce- cec cee cer cet ceu cex crc cre crr crt cru crx ctc cte ctr ctt ctu ctx cuc cue cur cut cuu cxc cxr cxt cxx ec- ecc ece ecr ect ecu ecx eec eee eer eet eex erc ere err ert eru etc ete etr ett etu etx eu- euc eue eur eut eux ex- exc exe exr ext exu exx rcc rce rcr rct rcu rcx re- rec ree rer ret reu rex rrc rrr rrt rru rtc rte rtr rtt rtu rtx ruc rue rur rut ruu rux rxr t-x tcc tce tcr tct tcu tcx te- tec tee ter tet teu tex trc tre trr trt tru trx ttc tte ttr ttt ttu ttx tuc tue tur tut tuu tux txe txt txu ucc uce ucr uct ucu uec uee uer uet ur- urc ure urr urt uru urx utc ute utr utt utu utx uuc uue uur uut uuu uxc uxr uxt uxu xcr xcx xee xer xet xeu xex xrc xrt xrx xtc xtr xtx xue xxx