-er c-- ccc cce ccm ccr ccs cct ccu ce- cec cee cem cer ces cet ceu cmc cme cmm cmr cms cmt cmu crc cre crm crr crs crt cru csc cse csm csr css cst csu ctc cte ctm ctr cts ctt ctu cuc cue cum cur cus cut cuu ec- ecc ece ecm ecr ecs ect ecu eec eee eem eer ees eet em- emc eme emm emr ems emt emu erc ere erm err ers ert eru es- esc ese esm esr ess est esu etc ete etm etr ets ett etu eu- euc eue eur eus eut m-r mc- mcc mce mcm mcr mcs mct mcu mec mee mem mer mes met meu mmc mme mmm mmr mms mmt mmu mrc mre mrm mrr mrs mrt mru msc mse msm msr mss mst msu mtc mte mtm mtr mts mtt mtu muc mue mum mur mus mut muu rcc rce rcm rcr rcs rct rcu re- rec ree rem rer res ret reu rmc rme rmm rmr rms rmt rrc rrm rrr rrs rrt rru rsc rse rsm rsr rss rst rsu rtc rte rtm rtr rts rtt rtu ruc rue rum rur rus rut ruu scc sce scm scr scs sct scu se- sec see sem ser ses set seu smc sme smm smr sms smt smu sr- src sre srm srr srs srt ss- ssc sse ssm ssr sss sst ssu stc ste stm str sts stt stu suc sue sum sur sus sut suu tcc tce tcm tcr tcs tct tcu te- tec tee tem ter tes tet teu tmc tme tmm tmr tms tmt tmu trc tre trm trr trs trt tru tsc tse tsm tsr tss tst tsu ttc tte ttm ttr tts ttt ttu tuc tue tum tur tus tut tuu ucc uce ucm ucr ucs uct ucu uec uee uem uer ues uet um- umc ume umm umr ums umt umu ur- urc ure urm urr urs urt uru usc use usm usr uss ust usu utc ute utm utr uts utt utu uuc uue uum uur uus uut uuu