Swap that out for the top function and then convolve that with the flat rectangular function and whatever result we see should describe a sum of four uniformly distributed random variables.
It's much more obvious that F convolved with G is the same thing as G convolved with F. Now, technically, the diagonal slices are not exactly the same shape.
During 10 years, I have been involved in the preparation of the scenario on young people, that was convolved by perpences in 2018, that how I was, I began to be involved in the, in a sinner, the bishop.