-er eee eef eel eep eer ef- efe eff efl efp efr ele elf ell elp elr ep- epe epf epl epp epr ere erf erl erp err fee fef fel fep fer ffe fff ffl ffp ffr fle flf fll flp flr fpe fpl fpp fpr fre frf frl frp frr l-p lee lef lel lep ler lfe lff lfl lfp lfr lle llf lll llp llr lpe lpf lpl lpp lpr lrf lrp lrr p-p pee pef pel pep per pfe pff pfl pfp pfr ple plf pll plp plr ppe ppf ppl ppp ppr pre prf prl prp prr re- ree ref rel rep rer rfe rff rfl rfp rfr rle rlf rll rlp rlr rpe rpf rpl rpp rpr rrf rrl rrp rrr