A new lettuce variety designated \u2018Truchas\u2019 is described. Both power driver transistors have an output terminal connected to an input terminal of the semiconductor power switch. However, it will often be the case that multiple blocks will be moved, and the present invention takes advantage of the fact that it is more efficient to process the shared memory movement of memory contents at the granularity of an extent. The second shaft is rotatable via the test element during normal operation of the joint.