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#!/usr/bin/perl
use warnings;
...
$minus = 1 - $from;

1 until check(my @chain = generate());

[3, 2], [1, 0], [5, 0], [-1, 3], [3, 3], [0, 0], [0, 2]

#!/bin/bash
i=0
...
    echo "$l"
    ((++i))
done < <(sort -u 1)

set xrange [-2:6]
set yrange [-2:6]
...
set term png
set output "4x4-16-" . out . ".png"
plot '2' using 1:2 with lines notitle, "4x4-16.grid" using 1:2:(0.1) w
+ith circles notitle