-er c-- ccc cce ccm ccr cct ccu ce- cec cee cem cer cet ceu cmc cme cmm cmr cmt cmu crc cre crm crr crt cru ctc cte ctm ctr ctt ctu cuc cue cum cur cut cuu ec- ecc ece ecm ecr ect ecu eec eee eem eer eet em- emc eme emm emr emt emu erc ere erm err ert eru etc ete etm etr ett etu eu- euc eue eur eut m-r mc- mcc mce mcm mcr mct mcu mec mee mem mer met meu mmc mme mmm mmr mmt mmu mrc mre mrm mrr mrt mru mtc mte mtm mtr mtt mtu muc mue mum mur mut muu rcc rce rcm rcr rct rcu re- rec ree rem rer ret reu rmc rme rmm rmr rmt rrc rrm rrr rrt rru rtc rte rtm rtr rtt rtu ruc rue rum rur rut ruu tcc tce tcm tcr tct tcu te- tec tee tem ter tet teu tmc tme tmm tmr tmt tmu trc tre trm trr trt tru ttc tte ttm ttr ttt ttu tuc tue tum tur tut tuu ucc uce ucm ucr uct ucu uec uee uem uer uet um- umc ume umm umr umt umu ur- urc ure urm urr urt uru utc ute utm utr utt utu uuc uue uum uur uut uuu