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loop: parse(corr)\loop parse(incorr)\loop;
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corr: brkts * = { < OK: > 1 * };
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brkts: brkt/null brkts = { 2 1 };
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brkt: <[> brkts <]> = { <[> 1 <]> };
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null: = {};
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incorr: smark ignore(<<>>) any(!<<>>) string(nonl) scopy ( * | () )
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= { <NOT OK: > 1 * };
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nonl: !<<
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>>;
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