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use strict;
use warnings;
...
sub mk_key {
    join SEP, @_;
}

[[2 .. 5], [2 .. 5], [2 .. 5]]
[[2, 4, 3, 5], [2, 3, 5, 4], [2, 5, 3, 4]]
[[3, 2, 4, 5], [4, 3, 2, 5], [2, 5, 4, 3]]
[[5, 4, 3, 2], [4, 5, 2, 3], [5, 2, 3, 4]]

[[2 .. 5], [2 .. 5], [2 .. 5]]
[[4, 5, 2, 3], [3, 5, 2, 4], [2, 5, 4, 3]]
[[3, 2, 4, 5], [4, 3, 2, 5], [2, 5, 4, 3]]
[[5, 4, 3, 2], [3, 4, 5, 2], [2, 5, 3, 4]]