2 3 the first pair of extended flat surface 2 3 comprises extended flat surfaces having a predefined width x 3 x 4 similar each flat surface of said second pair of extended flat surfaces 6 7 comprises a predefined width x 1 x 2 the recess or slot r between the extended flat surfaces is enough to provide space for the plaque thickness xc for pass through said recess the arrangement between plaques 1 u2032 1 u2033 is best shown in fig4 a through 4i accordingly each plaque 1 is divided into quadrants as show in fig2 top half left is quadrant a right is quadrant b bottom half left is quadrant c right is quadrant d a horizontal axis x x runs along the centerline of the length xa of the plaque while the vertical axis y y runs along the centerline of the width xb of the plaque the recesses as shown are configured to be perforated in the perimeter of a single quadrant for example the recess forming first pair 2 3 of extended flat surface is located at the first quadrant a and the second pair 6 7 of extended flat surfaces is limited to the fourth quadrant d each plaque is preferred to comprise the same configuration as shown in fig3 in order to provide single configuration to replicate for the manufacturing process the present configuration allows for easy insertion of one plaque into the other fig4 a through 4i provides different arrangement of a pair of plaques it is important to understand that the configuration such as the recesses and extended flat surfaces 2 3 6 7 configurations per quadrant assists the assembling of the plaques.