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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_statements(self):
 """Return a list of all Statements in a single list. Returns ------- stmts : list[indra.statements.Statement] A list of all the INDRA Statements in the model. """

        stmt_lists = [v for k, v in self.stmts.items()]
        stmts = []
        for s in stmt_lists:
            stmts += s
        return stmts