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PLS-00117:

Duplicate connect-by clause in table expression
Cause: Two or more CONNECT BY clauses were found in a SELECT statement. The CONNECT BY clause defines a relationship used to return rows in a hierarchical order. The relationship can contain two expressions separated by a relational operator (such as = or !=), but a statement can contain only one CONNECT BY clause.
Action: Remove one of the CONNECT BY clauses and, if necessary, separate expressions by a relational operator.