-er eee eef eeo eep eer ef- efe eff efo efp efr eo- eoe eof eoo eop eor ep- epe epf epo epp epr epz ere erf ero erp err erz eze ezf ezo ezr ezz fee fef feo fep fer fez ffe fff ffo ffp ffr ffz foe fof foo fop for foz fpe fpo fpp fpr fre frf fro frp frr oee oef oeo oep oer of- ofe off ofo ofp ofr ofz oo- oof ooo oop oor op- ope opf opo opp opr or- ore orf oro orp orr orz oze ozo ozz p-p pee pef peo pep per pez pfe pff pfo pfp pfr poe pof poo pop por poz ppe ppf ppo ppp ppr ppz pre prf pro prp prr prz pzp re- ree ref reo rep rer rez rfe rff rfo rfp rfr rfz roe rof roo rop ror roz rpe rpf rpo rpp rpr rpz rrf rrp rrr rze rzo zee zef zeo zep zer zez zfr zo- zoe zof zoo zor zpe zpf zpo zpp zpr zro zrp zzr zzz