Cats Claw
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Computational Linguist's Automated Workbench
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Bracketed expressions

Enter your bracketed expression here. You might try copying and pasting this expression:
[s [np [det the] [n cat]] [vp [v sat] [pp [p on] [np [det the] [n mat]]]]]
Be sure always to put a label immediately after "[" without any spaces. You may use parentheses "( )" instead of brackets "[ ]" .