this puzzle comes from the Tutorial section. Edgar Gidoni created a tutorial describing six steps needed to create a simple part. No doubt we can make the model 10X harder and solve it in half as many features: https://grabcad.com/tutorials/the-fastest-way-to-do-it-001
As usual most of the dimensions do not matter. But the 23 and 25 values in the top view add an additional layer of difficulty so be sure to capture that part of the design:
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