13 Example: Refined Abstract Domain s0s0 s1s1 s2s2 pqpq q s3s3 a0a0 Over-ApproximationUnder-Approximation AX (p ⋁ ¬ p) is true EX (q) is inconclusive a2a2 a3a3 pqpq a0a0 a2a2 q a3a3 pqpq a0a0 a2a2 q a3a3 Partitioned domain does not work.
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