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There is an oak tree and a chestnut tree. Some owls are sitting on them.

An owl on the oak tree says to the owls on chestnut trees "If one of you comes here to our tree, our number shall be double than yours."

An owl on the chestnut tree replies "If one of you comes here to our tree, both trees will hold equal number of owls."

How many owls are sitting on the oak and chestnut tree?