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A.are to challenge2w0\6`2_(y5x0r.I6}(s'?4c*Q
C.have been challenged2w0\6`2_(y5x0r.I6}(s'?4c*Q
B.may be challenged2w0\6`2_(y5x0r.I6}(s'?4c*Q
D.are challenging2w0\6`2_(y5x0r.I6}(s'?4c*Q