Eo

According to the Old English Dictionary:

I. unaccented,

eo

generally stands before two consonants lc, ld, lf, rc, rd, rf, rg, rh, rl, rm, rn, rp, rr, rt, rþ, x; as, Geolca a yolk, sceolde should, seolfor silver, deorc dark, sweord a sword, ceorfan to carve, beorgan to protect, beorht bright, eorl earl, beorma barm, eornost earnest, weorpan to throw, steorra a star, heorte the heart, eorþe the earth, meox dung. II. eó accented, the diphthong, generally stands before the consonants c, d, f, g, h, l, m, n, p, r, s, st, t, w; as, Seóc sick, beódan to bid, þeóf a thief, fleógan to fly, hreóh rough, hweól a wheel, leóma a ray of light, beón to be, deóp deep, beór beer, ceosan to choose, breóst the breast, fleótan to float, leóþ a song, ceówan to chew. 2. eó is also the termination of many words, and then the ó in eó is always accented; as, Beó a bee; ic beó I shall be; freó free; gleó glee; seó the; seó sim, sis, sit; treó a tree; breó three, etc eo