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Let us now extend the CSP–GSB calculus in the following way:
 
Let us now extend the CSP–GSB calculus in the following way:
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The first extension is the ''reflective extension of logical graphs'', or what may be described as the ''cactus language'', after its principal graph-theoretic data structure.
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The first extension is the ''reflective extension of logical graphs'', or what may be described as the ''cactus language'', after its principal graph-theoretic data structure. It is generated by generalizing the negation operator <math>\texttt{(\_)}\!</math> in a particular manner,
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