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string generation, variable `$l_min`  would have the successive values
0, -1,  -3 and -4  (skipping -2 because we  insert two columns  in one
go). Yet,  during the  second HTML  string generation,  `$l_min` would
have  a strange  behaviour. When  printed from  outside the  `l2p_lin`
function, I would have values 0, -1,  -3 and -4, but when printed from
within the `l2p_lin` function it would always give -4.

Here  is the  hypothetical explanation.  During the  first generation,
function `l2p_lin` would  use the proper value for  `$l_min`, that is,
0, then -1,  then -3 and lastly -4. When  method `html` ends, function
`l2p_lin` is still  alive thanks to the closure  mechanism. And thanks
to the  same closure  mechanism, variable  `$l_min` still  exists with
value  -4 because  it is  used by  `l2p_lin`. Then,  method `html`  is
called a second  time to check CSS usage. This  defines a new instance
of  variable `$l_min`,  initialised  to  0. On  the  other hand,  when
reading the definition

```
  # Perl
  sub l2p_lin($logl) {
    my $result = $logl - $l_min;