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The set of live variables between lines 2 and 3 is {<code>b</code>, <code>c</code>} because both are used in the multiplication on line 3. But the set of live variables after line 1 is only {<code>b</code>}, since variable <code>c</code> is updated later, on line 2. The value of variable <code>a</code> is not used in this code.
Note that the assignment to <code>a</code> may be eliminated as <code>a</code> is not used later, but there is insufficient information to justify removing all of line 3 as <code>f</code> may have [[Side effect (computer science)|side effects]] (printing <code>b * c</code>, perhaps).
== Expression in terms of dataflow equations ==
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