rectangular bar array 3d model

A precise, planar 3D geometric model of an array consisting of exactly twelve straight, parallel, unadorned rectangular prisms (bars) arranged side-by-side. The entire collective assembly of all bars and the narrow, uniform-width gaps separating them must form a perfect, large square. The width of the individual bars follows a specific, symmetrical pattern across the width of the array: starting from one side, there are 4 wide bars, followed by 1 narrow bar, then 1 wide bar, then 2 narrow bars, and finally 4 wide bars. All bars lie completely and precisely within a single flat plane. The longitudinal ends of all twelve bars are perfectly aligned and clean, straight edges with no downward or vertical bends, creating a seamless rectangular perimeter. The individual bars and the uniform gaps maintain their specified dimensions for the entire length required to achieve the exact overall square form.