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1must_dependence: "{ }"2may_dependence: "{ [S_1[] -> __pet_ref_2[]] -> [[S_2[] -> __pet_ref_4[]] -> a[]]; [S_1[] -> __pet_ref_1[]] -> [[S_2[] -> __pet_ref_4[]] -> a[]] }"3must_no_source: "{ }"4may_no_source: "{ }"5 1must_dependence: "{ }"2may_dependence: "{ [S_1[] -> __pet_ref_2[]] -> [[S_2[] -> __pet_ref_4[]] -> a[]]; [S_1[] -> __pet_ref_1[]] -> [[S_2[] -> __pet_ref_4[]] -> a[]] }"3must_no_source: "{ }"4may_no_source: "{ }"5