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:- set_prolog_flag(double_quotes,chars). paired_braces --> "". paired_braces --> "(", paired_braces, ")", paired_braces. paired_braces --> "[", paired_braces, "]", paired_braces. paired_braces --> "{", paired_braces, "}", paired_braces. paired_braces --> "<", paired_braces, ">", paired_braces.