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K ? R E⊃RK⊃E\frac { E \supset R } { K \supset E }

Question 282

Multiple Choice

K ? R E⊃RK⊃E\frac { E \supset R } { K \supset E }


A) HS-valid.
B) CD-valid.
C) Invalid.
D) CD-invalid.
E) DA-invalid.

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