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On improving efficiency of model checking through systematically ...

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transition<br />

l10’ = if p1<br />

then<br />

else l10;<br />

l11’ = if p1 then l10<br />

else l11;<br />

l12’ = if p1 then l11<br />

else l12;<br />

if l12 then not lock1<br />

else l13<br />

l13’ = if p1 then l12 and lock1 and c1>2<br />

else l13;<br />

l20’ = if p2<br />

then if l22 then not lock2<br />

else l23<br />

else l20;<br />

l21’ = if p2 then l20<br />

else l21;<br />

l22’ = if p2 then l21<br />

else l22;<br />

l23’ = if p2 then l22 and lock2 and c2>2<br />

else l23;<br />

lock1’ = if p1 then<br />

if l11 then true<br />

else if l13 then false<br />

else lock1<br />

else if p2 then<br />

if l21 or l23 then false<br />

else lock1<br />

else lock1;<br />

lock2’ = if p2 then<br />

if l21 then true<br />

else if l23 then false<br />

else lock2<br />

else if p1 then<br />

if l11 or l13 then false<br />

else lock2<br />

else lock2;<br />

c1’ = if tick then c1+1<br />

71

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