24 Phonology l§§ 62-4 beside OE. libban, to live; OHG. quec beside OE. cwlc, quick, alive. § 62. a, followed originally by an a, ð, or ē in the next syllable, became ο when not protected by a nasal-I-consonant or an intervening 1 or j, as OE. dohtor, OS. dohter, OHG. tohter, Gr. θυγάτηρ, daughter; O.Icel. ok, OHG. job, Gr. ίυγόκ, yoke; OE. OS. god, OHG. got, from an original form *ghutom, god, beside OHG. gutin, goddess; pp. OE. geholpen, OS. giholpan, OHG. giholfan, helped, beside pp. OE. gebunden, OS. gibunđan, OHG. gibuntan, bound; pp. OE. geboden, OS. gibodan, OHG. gibotan, offered, beside pret. pi. OE. buđon, OS. buđun, OHG. butum, we offered. Every prim. Germanic ο in accented syllables was of this origin. Cp. § 39. u became ū under the same conditions as those by which a and i became a and ī, as pret. third pers. singular Goth, þūhta, OS. thúhta, OHG. dūhta, OE. þūhte, beside inf. Goth, þugkjan, OS. thunkian, OHG. dunken, OE. þyncan, to seem; and similarly in Goth, ūhtwō, OS. OHG. ūhta, OE. ūhte, daybreak, dawn. § 63. The diphthong eu became iu when the next syllable originally contained an i, ī, or j, cp. § 6O (z), but remained eu when the next syllable originally contained an á, δ, or ē. The iu remained in OS. and OHG., but became jū (y by i-umlaut) in O.Icel., and ío (īe by i-umlaut) in OE., as Goth, liuhtjan, OS. liuhtian, OHG. liuhten, OE. Hehtan, to give light, beside OS. OHG. iioht, OE. lēoht, alight; O.Icel. dypt, OS. diupi, OHG. tiufī, OE. dīepe, depth, beside O.Icel. djūpr, OS. diop, OHG. tiof, OE. dēop, deep; OS. kíusid, OHG. kiusit, O.Icel. kys(s), OE. cīesþ, he chooses, beside inf. OS. OHG. kiosan, O.Icel. kjōsa, OE. cēosan, to choose. § 64. From what has been said in §§ 69-63, it will be seen that the prim. Germanic vowel-system had assumed the following shape before the Germanic parent language