SWI-Prolog -- library(varnumbers)

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library(varnumbers)

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F.2.61 library(varnumbers)

max_var_number/3	True when Max is the max of Start and the highest numbered $VAR(N) term.
numbervars/1	Number variables in Term using $VAR(N).
varnumbers/2	Inverse of numbervars/1.
varnumbers/3	Inverse of numbervars/3.
varnumbers_names/3	If Term is a term with numbered and named variables using the reserved term’$VAR’(X), Copy is a copy of Term where each’$VAR’(X) is consistently replaced by a fresh variable and Bindings is a list‘X = Var`, relating the‘X` terms with the variable it is mapped to.