A.1) a=2;b=1
2) S={-1;-1/2;1/2;1}
B.1) a=1;b=2
2) S={-1;-1/2;1/2;1}
C.1) a=2;b=1
2) S={1/2;1}
D.1) a=1;b=2
2) S={1/2;1}

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