The side length is one centimeter, and the sum of the front and back areas is exactly equal to the sum of the upper and lower areas and the left and right areas, and the side length is no more than 7 centimeters. Description length = width+height

According to the meaning of the question: there are three groups of 7= 6+ 1 7=2+5 7=3+4, that is to say, the length is 7 cm, the width can be 6, 5, 4 cm, or 1, 2, 3 cm, and vice versa.