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Functional Coverage using IMC

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Hello All

        I have three test cases, say test_1, test_2, and test_3. I have generated functional coverage for each test case individually. when I try to merge the coverage of test_1, test_2, and test_3, the functional coverage was 45%. Then I changed order during merging i.e:- test_3, test_1, and test_2, functional coverage was 65 %. 

      By changing the order of test cases, during merging the functional coverage got increased.!  Could someone explain to me, How functional coverage increased by changing the order of test cases during merging?


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