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import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,100))
r=w0.sketch().segment((-58,-58),(58,-58)).segment((58,58)).segment((-41,58)).arc((-35,20),(-58,-10)).close().assemble().rect(60,78,mode='s').rect(48,48).finalize().extrude(-200)