my @arr1 = (
['a', 1, 2, 3],
['b', 4, 4, 3],
['d', 5, 2, 'H'],
);
my @arr2 = (
['a', 1, 2, 3],
['d', 5, 'f', 'H'],
['c', 8, 'r', 9],
);