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Live-variable analysis

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The live variable analysis calculates for each program point the variables that may be potentially read afterwards before their next write update. 

1: a = 3;
2: c = 5;
3: a = b + c;

The set of live variables at line 2 is {b,c}, but the set of live variables at line 1 is only {b} since variable "c" is updated in line 2.

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