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@Monkle First, some linguists agree that Old English is not English at all and should be called ‘Anglo-Saxon language’. Second, It's hard to explain but never happened to you that you discover that you were not searching for what you asked but only realize after you make the question? Actually, I should have asked ‘what's the purpose of the double consonants?’
@FumbleFingers So, how is this quiestion different than the one I did this time. There could be multiple answers, too. In fact, there are multiple ‘correct’ answers. Following that argument, all of my questions should be closed.