Assertion: forest's area | /r/CapableOf | become in turn
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Source sentences:
text: In turn, as Northumbrian influence waned, the westernmost areas of Bowland became part of Amounderness, a territory forged by the Norse hold Agmundr, a vassal of Eowils, Halfdan and Ingwaer, co-kings of Jorvik, in the early 10th century.