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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-12))
r=w0.sketch().segment((-42,-20),(0,-20)).segment((0,22)).arc((-21,11),(-42,22)).close().assemble().reset().face(w0.sketch().arc((-42,54),(-21,65),(0,54)).segment((0,96)).segment((-42,96)).close().assemble()).finalize().extrude(-88).union(w0.sketch().push([(19,-41)]).rect(46,110).push([(19.5,-41)]).rect(41,30,mode='s').finalize().extrude(112))