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- Entry && I / O=true;
- During && I /O=false;
- Exit && I1 / I1=true, I2=false;
- Exit && [I1 &&I2] / I1=true, I2=false;
- Entry && # I / O=true;
- Entry && # 3 I / O=true;
Transition
Question: use the commutativity of AND and OR? if(A!=null && A.val=1)?
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