OHG

The cause of these double forms is in a great measure due to the two OHG.

Before other consonants when followed by an or j in the next syllable, and further in OHG.

The singular of nouns of this declension was inflected like the a-stems ( 42) already in OHG.

Umlaut must have taken place earlier in the spoken language than it is expressed in late OHG.

The guttural nasal disappeared in an unstressed syllable when preceded by an n in a stressed syllable in the course of the OHG.