hi, in lesson 4, it is write that "endings like -um that have an u
in them, will modify any a in preceding stems, changing them to ö",
ok, this is prety simple. But in lessons, it happens some times
that a "a" in the stems is not change to a "ö" even if the word have
a "u" endings. For exemples, (in exercise and solution of lesson
5,) : eta þeir vel í VANGINUM, brennr í GARÐINUM, víkingarnir biða
með JARLINUM. Even in the reference in lesson 6 : haukum,
haukinum, haukunum, manninum. These words shouldn't take a "ö" ???