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loginid INT4 REFERENCES login (loginid) NOT NULL,
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worksheetid INT4 REFERENCES worksheet (worksheetid) NOT NULL,
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PRIMARY KEY (problemid,loginid, worksheetid)
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CREATE TABLE test_suite (
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problemid TEXT REFERENCES problem (identifier) NOT NULL,
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suiteid INT4 REFERENCES test_suite (suiteid) NOT NULL,
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CREATE TABLE suite_variables (
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suiteid INT4 REFERENCES test_suite (suiteid) NOT NULL,