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|  | Predicate interpolate_string/4 | 
 interpolate_string(:In, 
-Out, +Map, +Options)
interpolate_string(:In, 
-Out, +Map, +Options)Name=Value, insert Value 
using write/1. If Name 
does not appear in Map, raise an existence error.
Name must satisfy the rules for a Prolog variable.current_output) of Goal 
here. For safety reasons only accepted if Options contains
goals(true)