Please show all work and steps

Given the $3$D modeling of a part below:

$1.$ Using only the solid primitives and Boolean operations develop a CSG tree for the part.

$2.$ Develop the partial B$-$rep representation of the part $($show the geometric entities, Vertices, Edges, etc. on the figure$).$

$3.$ Verify the Euler's equation on this object. Is this object a manifold or no$-$manifold solid object?

$4.$ For the given drawing, identify the feature by applying AAG method and decision tables. You must develop AAG graph $($and sub$-$graphs$).$