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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-9))
r=w0.sketch().segment((35,93),(77,92)).arc((56,99),(35,93)).assemble().finalize().extrude(-91).union(w0.sketch().segment((-39,-96),(-39,-59)).segment((-31,-59)).arc((-77,-69),(-39,-96)).assemble().finalize().extrude(109))