Software Testing Verification Validation and Quality Assurance Question

Use http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1702019 If you need a reference

1) Explain why All-DU-Paths in data-flow-based criteria strictly subsumes All-Uses in data-flow-based criteria. (5 points) 2) Explain why All-P-Uses in data-flow-based testing strictly subsumes Branch Coverage (aka All Edges) in control-flow-based criteria. (5 points)