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use v5.12;
use warnings;
...
}

pp $X_Y;

[[1, -4, 7], [-2, 3, 3]]
[[8, -9, -6, 5], [1, -3, -4, 7], [2, 8, -8, -3], [1, 2, -5, -1]]
...
  [-4, -16, 16, 6, 6, 24, -24, -9, 6, 24, -24, -9],
  [-2, -4, 10, 2, 3, 6, -15, -3, 3, 6, -15, -3],
]