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local arrs = [ [[]], [[1, 2]], [[1], [2]], [[1, 2], []], ]; [ { ['%s < %s' % [x, y]]: x < y, ['%s > %s' % [x, y]]: x > y, ['%s <= %s' % [x, y]]: x <= y, ['%s >= %s' % [x, y]]: x >= y, } for x in arrs for y in arrs ]