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The first four members of this family of operators are shown below, with paraphrases in a couple of other notations, where tildes and primes, respectively, indicate logical negation.
 
The first four members of this family of operators are shown below, with paraphrases in a couple of other notations, where tildes and primes, respectively, indicate logical negation.
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{| align="center" cellpadding="10" style="text-align:center"
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{| align="center" cellpadding="8" style="text-align:center"
 
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<math>\begin{matrix}
 
<math>\begin{matrix}
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