In the rectangular coordinate plane points X and Z lie on the same line through the origin and points W and Y lie on the same line through the origin. If$$ a^{2} + b^{2} = c^{2} + d^{2} and e^{2} + f^{2} = g^{2} + h^{2}$$, what is the value of length XZ – length WY?
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正确答案: C