Book marker tab holder

This is a simple book marker tab holder designed around the following book tabs that are available on Amazon: https://www.amazon.com/gp/product/B081Q3J223/

The basic idea is to be able to clip marker tabs to a book while you read it so they are readily available as shown in the image

For education the .stl took about 15 minutes to design in Autocad using pline, extrude, and subtract commands only so it is suitable for modding for different size holders or book tabs. The .dwg file is attached. In the .dwg Version 3 is the correct one and is given both as the final solid and the extruded shapes before the subtract command was used.