-er c-- ccc cce ccl ccr ccs cct ccu ce- cec cee cel cer ces cet ceu cl- clc cle cll clr cls clt clu crc cre crl crr crs crt cru csc cse csl csr css cst csu ctc cte ctl ctr cts ctt ctu cuc cue cul cur cus cut cuu ec- ecc ece ecl ecr ecs ect ecu eec eee eel eer ees eet elc ele ell elr els elt elu erc ere erl err ers ert eru es- esc ese esl esr ess est esu etc ete etl etr ets ett etu eu- euc eue eul eur eus eut lcc lce lcl lcr lcs lct lcu lec lee lel ler les let leu llc lle lll llr lls llt llu lrc lrr lrs lrt lru lsc lse lsl lsr lss lst lsu ltc lte ltl ltr lts ltt ltu luc lue lul lur lus lut luu rcc rce rcl rcr rcs rct rcu re- rec ree rel rer res ret reu rlc rle rll rlr rls rlt rlu rrc rrl rrr rrs rrt rru rsc rse rsl rsr rss rst rsu rtc rte rtl rtr rts rtt rtu ruc rue rur rus rut ruu scc sce scl scr scs sct scu se- sec see sel ser ses set seu slc sle sll slr sls slt slu sr- src sre srl srr srs srt ss- ssc sse ssl ssr sss sst ssu stc ste stl str sts stt stu suc sue sul sur sus sut suu tcc tce tcl tcr tcs tct tcu te- tec tee tel ter tes tet teu tlc tle tll tlr tls tlt tlu trc tre trl trr trs trt tru tsc tse tsl tsr tss tst tsu ttc tte ttl ttr tts ttt ttu tuc tue tul tur tus tut tuu ucc uce ucl ucr ucs uct ucu uec uee uel uer ues uet ulc ule ull ulr uls ult ulu ur- urc ure url urr urs urt uru usc use usl usr uss ust usu utc ute utl utr uts utt utu uuc uue uur uus uut uuu