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SELECT T2,GO FROM test WHERE T1 IN (SELECT T2 FROM test WHERE T1 IN (SELECT T2 FROM test WHERE T1 IN (SELECT T2 FROM test WHERE T1 = "A")));
SELECT t4.*,t3.*,t2.*,t1.* FROM test as t1 JOIN test as t2 ON t2.T1=t1.T2 JOIN test as t3 on t3.T1=t2.T2 JOIN test as t4 on t4.T1=t3.T2;