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use strict;
use warnings;
...
}

print $tb;

.--------------------------------------.
| WordF1     | WordF2     | Difference |
...
| consenso   | consenso   |    0.00887 |
| vergogna   | vergogna   |    0.00592 |
'------------+------------+------------'

use strict;
use warnings;
...
}

print $tb;

.----------------------------------------------------.
| WordF1            | WordF2            | Difference |
...
| consensuale       | consensuale       |  -0.000230 |
| consenso          | consenso          |  -0.008922 |
'-------------------+-------------------+------------'