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    ### execute command
    ### get the data
    $dbHandle=$db->prepare($dbCommand);
    $dbHandle->execute();
    my $data = $dbHandle->fetchall_arrayref();

my $var1 = 0;
my $var2 = 1;

# Draw an axis with a pencil and a ruler
function($var1, $var2);

my $pencil = 0;
my $ruler  = 0;
...
        $pencil++;
    }
}