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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-51))
r=w0.workplane(offset=-13/2).moveTo(-34,43).box(88,114,13).union(w0.sketch().segment((-13,-100),(-7,-100)).arc((32,-64),(72,-100)).segment((78,-100)).arc((32,-57),(-13,-100)).assemble().finalize().extrude(116))