(a) In Example 7.30, (1, 2, 5, 6) is considered a def-clear path with respect to count defined at node 1 and used at node 5. Considering that count is defined at node 6, why is this redefinition of...

(a) In Example 7.30, (1, 2, 5, 6) is considered a def-clear path with respect to count defined at node 1 and used at node 5. Considering that count is defined at node 6, why is this redefinition of count not masking the definition of count at node 1? (b) Construct two complete paths through the data flow graph in Figure7.7 that are def-clear with respect to the definition of count at node 6 and its use in the same node.