Hello everyone, got back from an exhausting days work at just about 18.00. Had to cook dinner, a tomatoey, bacony pasta thing, then check in with Herself, now finishing off the Tempranillo. Couldn't resist a peek at the thread before preparing for another days work tomorrow.
Devadolly, as far as 39ac is concerned, axes is not the plural of hatchets, it is the plural of each of the horizontal and vertical axis on a graph, represented by an unknown! So you should now be able to work forwards as well as backwards.
At least tomorrow, the meeting will finish by 14.00, and that includes lunch, and I am only participating not Chairing, which makes life easier.