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William Penn included this piece of green space in his original city plan as one of five squares, although the park was slow to develop because it was a marshy land.<unk> William Penn included this piece of green space in his original city plan as one of five squares, although the park was slow to develop because it was a marshy land.<unk> William Penn included this piece of green space in his original city plan as one of five squares, although the park was slow to develop because it was a marshy land.<unk> William Penn included this piece of green space in his original city plan as one of five squares, although the park was slow to develop because it was a marshy land.