Day 292

Worked on the expression evaluator. M drove me to the recycling place: got £3.60 for 9kg of cans. Stopped at Sainsbury's on the way back, got 6 cans of lager - sort of perpetual motion. Back to M's for tea and Neighbours.

Later more EE - with the aid of working out the algorithm on bits of paper in piles representing stacks, corrected the latest problem. Still some unary minus/bracket issues to tackle - think I've got the solution.