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import cadquery as cq
w0=cq.Workplane('YZ',origin=(-81,0,0))
r=w0.sketch().rect(200,136).rect(112,108,mode='s').finalize().extrude(142).union(w0.sketch().arc((22,-31),(23,-10),(38,4)).arc((-35,15),(22,-31)).assemble().finalize().extrude(161))