690-600= 570-400= 580-500= 880-800=
760-200= 750-600= 960-700= 620-600=
550-300= 560-500= 430-400= 830-300=
770-400= 870-600= 630-200= 950-300=
240-100= 970-300= 470-100= 760-500=