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#!/usr/bin/perl

...
  }

pp up [ 3, 1 ];

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(
  [[0, 0], [1, 0], [2, 0], [3, 1]],
  [[0, 0], [1, 0], [2, 1], [3, 1]],
  [[0, 0], [1, 1], [2, 1], [3, 1]],
)