sicp-ex-3.38


a)

If no interleaving is possible the resulting values can be:

45: Peter +10; Paul -20; Mary /2 35: Peter +10; Mary /2; Paul -20 45: Paul -20; Peter +10; Mary /2 50: Paul -20; Mary /2; Peter +10 40: Mary /2; Peter +10; Paul -20 40: Mary /2; Paul -20; Peter +10