1. Consider procedure calls that may be taken to be instances of the USES relati

1. Consider procedure calls that may be taken to be instances of the USES relation. Mutually recursive modules do not form a hierarchy. Direct recursion within a module, however, is allowed in a hierarchy. Are these statements correct? If so, what is their justification? 2. Can you define the concept of level for a general graph rather than for a DAG? Why? Why not? What does this imply about a USES relation that is not a hierarchy?

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