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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-4))
r=w0.sketch().arc((38,-93),(52,-93),(63,-86)).arc((51,-91),(38,-93)).assemble().finalize().extrude(-96).union(w0.sketch().segment((-63,86),(29,86)).segment((29,94)).segment((-38,94)).segment((-38,92)).segment((-41,92)).segment((-41,94)).segment((-63,94)).close().assemble().finalize().extrude(104))