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Predicate interpolate_string/4
 interpolate_string(:In, -Out, +Map, +Options)
Establish a string from a template by replacing patterns. Supported patterns are:
{Name}
If Map contains 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.
{Name,Default}
As above, but if Name does not appear in Map, use Value
{@Goal}
Insert the output (to current_output) of Goal here. For safety reasons only accepted if Options contains goals(true)
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