Study the following information and answer the question. Seven villages A, B, C, D, E, F and G are situated as follows:
E is 2 km to the west of B F is 2 km to the north of A C is 1 km to the west of A D is 2 km to the south of G G is 2 km to the east of C D is exactly in the middle of B and E.
How far is D from F (in km) as the crow flies?
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