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Which Rule Is Used in the Following Inference JRRJ\begin{array} { l } \mathrm { J } \supset \mathrm { R } \\\sim \mathrm { R } \\\sim \mathrm { J }\end{array}

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Which rule is used in the following inference? JRRJ\begin{array} { l } \mathrm { J } \supset \mathrm { R } \\\sim \mathrm { R } \\\sim \mathrm { J }\end{array}


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