Looking at the bottom-right most circle, which contains "=2", we know that both of itsneighbours must be filled in to obtain:Noticing the circle labelled "=4", all four of its neighbours must be filled in, yielding:At this point, all circles are satisfied. Examining each of the remaining circles, we see that theycannot be filled in. Specificallyif the "=1" circle was filled in, then the "=3" circle would be incorrectif the "=2" circle was filled in, the "