a. Explain the term refinement in the domain of formal methods. (4 Marks)
b. Determine if the following propositions is valid using truth tables. (6 Marks)
((P?H) ? ¬ H) P
c. Explain with suitable example the principle of operation of heap sort. (4 Marks)
d. Explain the steps in the abstract model specifications. (6 Marks)
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