// Remove the end face for the extrusion.
firstSketch = startSketchOn(XY)
    |> startProfile(at = [-12, 12])
    |> line(end = [24, 0])
    |> line(end = [0, -24])
    |> line(end = [-24, 0])
    |> close()
    |> extrude(length = 6)

// Remove the end face for the extrusion.
firstShell = shell(
    firstSketch,
    faces = [END],
    thickness = 0.25,
)

secondShell = clone(firstShell)
    |> translate(x = 50)