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indicates concession or compromise
indicates permission
ここに座っすわってもいいですか。
May I sit here?
明日あす来こなくてもいいと言わいわれた。
I was told I don't have to come tomorrow.
食べたべても良いよいと言わいわれて安心あんしんした。
I was relieved to be told it was okay to eat.