-er eee eef eel eem eer ef- efe eff efl efm efr ele elf ell elm elr em- eme emf eml emm emr ere erf erl erm err fee fef fel fem fer ffe fff ffl ffm ffr fle flf fll flm flr fme fmf fml fmm fmr fre frf frl frm frr lee lef lel lem ler lfe lff lfl lfm lfr lle llf lll llm llr lme lmf lml lmm lmr lrf lrm lrr m-f m-r mee mef mel mem mer mfe mff mfl mfm mfr mle mlf mll mlm mlr mme mmf mml mmm mmr mre mrf mrl mrm mrr re- ree ref rel rem rer rfe rff rfl rfm rfr rle rlf rll rlm rlr rme rmf rml rmm rmr rrf rrl rrm rrr