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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-12))
r=w0.sketch().segment((-15,42),(31,42)).segment((31,-7)).segment((35,-7)).segment((35,42)).segment((83,42)).segment((83,52)).segment((35,52)).segment((35,100)).segment((31,100)).segment((31,52)).segment((-15,52)).close().assemble().finalize().extrude(-3).union(w0.sketch().segment((-83,-21),(-27,-21)).arc((-20,-42),(-2,-55)).segment((-2,-100)).segment((30,-100)).segment((30,-47)).arc((29,3),(-20,-3)).segment((-20,37)).segment((-83,37)).close().assemble().finalize().extrude(27))