midstring - Robuta Search

https://cliopatria.swi-prolog.org/swish/pldoc/doc_for?object=quintus%3Amidstring/5 quintus:midstring/5 quintus midstring https://eu.swi-prolog.org/pldoc/doc_for?object=quintus%3Amidstring/3 quintus:midstring/3 quintus midstring