The composition of football

Made of several pieces of black and white leather. All black and white blocks can be approximately regarded as congruent regular pentagons and regular hexagons. In this way, football can be approximately regarded as a polyhedron.

The characteristics of football: each black square is adjacent to five white squares, each white square is adjacent to three black squares and three white squares (black and white), each vertex is connected with three sides, and each vertex of "football" happens to be the vertex of a black square.

The ball for competition should be round, its shell should be made of leather or other recognized materials, and materials that may harm athletes should not be used in its structure.