-er c-- ccc cce ccf ccl ccr ccs ccu ce- cec cee cef cel cer ces ceu cfc cfe cff cfl cfr cfs cfu cl- clc cle clf cll clr cls clu crc cre crf crl crr crs cru csc cse csf csl csr css csu cuc cue cuf cul cur cus cuu ec- ecc ece ecf ecl ecr ecs ecu eec eee eef eel eer ees ef- efc efe eff efl efr efs elc ele elf ell elr els elu erc ere erf erl err ers eru es- esc ese esf esl esr ess esu eu- euc eue euf eul eur eus fcc fce fcf fcl fcr fcs fcu fec fee fef fel fer fes feu ffc ffe fff ffl ffr ffs ffu flc fle flf fll flr fls flu frc fre frf frl frr frs fru fsc fse fsf fsl fsr fss fsu fue fuf ful fur fus fuu lcc lce lcf lcl lcr lcs lcu lec lee lef lel ler les leu lfc lfe lff lfl lfr lfs lfu llc lle llf lll llr lls llu lrc lrf lrr lrs lru lsc lse lsf lsl lsr lss lsu luc lue luf lul lur lus luu rcc rce rcf rcl rcr rcs rcu re- rec ree ref rel rer res reu rfc rfe rff rfl rfr rfs rfu rlc rle rlf rll rlr rls rlu rrc rrf rrl rrr rrs rru rsc rse rsf rsl rsr rss rsu ruc rue ruf rur rus ruu scc sce scf scl scr scs scu se- sec see sef sel ser ses seu sfc sfe sff sfl sfr sfs sfu slc sle slf sll slr sls slu sr- src sre srf srl srr srs ss- ssc sse ssf ssl ssr sss ssu suc sue suf sul sur sus suu ucc uce ucf ucl ucr ucs ucu uec uee uef uel uer ues ufc ufe uff ufl ufr ufs ufu ulc ule ulf ull ulr uls ulu ur- urc ure urf url urr urs uru usc use usf usl usr uss usu uuc uue uur uus uuu