One final try today. The ones I can't solve are: 32, 33, 35, 41, 44, 50, 52, 53, 58, 62, 63, 70, 72, 78, 79, 82, 83, 87, 88, 91, 96 and 98. Oh dear that looks an awful lot but if I could be guided in the right direction for at least some of them, that would be fantastic. Many thanks in advance.