-er eee eef eel eep eer ef- efe eff efi efl efp efr eie eif eii eil eip eir ele elf eli ell elp elr ep- epe epf epi epl epp epr ere erf eri erl erp err fee fef fei fel fep fer ffe fff ffi ffl ffp ffr fie fif fii fil fip fir fle flf fli fll flp flr fpe fpi fpl fpp fpr fre frf fri frl frp frr i-f ie- iee ief iei iel iep ier ife iff ifi ifl ifp ifr iie iif iii iil iip iir il- ile ilf ili ill ilp ilr ipe ipf ipi ipl ipp ipr ir- ire irf iri irl irp irr l-p lee lef lei lel lep ler lfe lff lfi lfl lfp lfr lie lif lii lil lip lir lle llf lli lll llp llr lpe lpf lpi lpl lpp lpr lrf lri lrp lrr p-p pee pef pei pel pep per pfe pff pfi pfl pfp pfr pie pif pii pil pip pir ple plf pli pll plp plr ppe ppf ppi ppl ppp ppr pre prf pri prl prp prr re- ree ref rei rel rep rer rfe rff rfi rfl rfp rfr rie rif rii ril rip rir rle rlf rli rll rlp rlr rpe rpf rpi rpl rpp rpr rrf rri rrl rrp rrr