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| Greetings, I am looking into how to apply rules, particularly like the rule of order $2_2 \rightarrow 4_2$ I would like to use a rule like: $\{\{a,x\}, \{a,y\} \} \rightarrow \left\{\{a,x\}, \{a,y\}, \{x,b\}, \{y,b\}\right\}$, but rule could be... |