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