I completed this quiz without understanding what the numbers were about in part 2, so I expect I've got a lot wrong. Can I take this opportunity to ask that when the next competition is set, more explanation is put on the quiz sheet about what the letters and numbers stand for, with a worked example at the top of each section. It won't spoil the quiz, but clearly a lot of people like myself were confused by the numbers, and this would ensure that the same confusion doesn't happen in the next quiz. It must take an awful long time to compose a quiz like this, and I am sure a lot more people would enter if these small adjustments were made.Thank you.