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sub print_if_true
{
    my $value = shift;
...

print_if_true( 1 );
print_if_true( 0 );

sub print_if_true
{
    my $value = shift;
...
        print "Value '$value' is false!\n";
    }
}

sub print_if_true
{
    my $value = shift;
...

    print "This always prints.\n";
}