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    #...call to function
    &SomeFunction($a, $b, $c);
...
    @args = ("$program $a $b $c");
    system(@args) == 0
        or die "system @args failed: $?";

    #...call to function
    &SomeFunction($a, $b, '$c');
...
    @args = ("$program $a $b '$c'");
    system(@args) == 0
        or die "system @args failed: $?";