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Fen

A fen is a particular type of low-lying bog[?] ecosystem fed by groundwater and runoff, and containing peat below the waterline. It may feature waterways and standing water. It differs from a marsh, which contains a permanent body of water but no peat.

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Quadratic formula

... that does not depend on x) to the expression to the left of "=", that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is ...