Manufacturing integrated circuits is an enormously complicated task, as there are many process variables that can be manipulated (thickness of this, width of that, doping level of something else, etc). Generally speaking, many copies of a circuit are put onto a single wafer, which is made all at once. We have an experiment where we are varying two factors, each at two levels. We have 20 wafers and assign each of the four factor/level combinations to five wafers at random and make the wafer. We then choose three circuits at random on each wafer and measure the performance of the circuit. Construct a skeleton ANOVA table (that is, just the sources and degrees of freedom).