[2,3,4,2,4,5,3,4,5,2,5,6,3,4,6,3,5,6,2,6,7,3,5,7, 4,5,6,3,6,7,4,5,7,2,7,8,3,6,8,4,5,8,4,6,7,3,7,8,4, 6,8,5,6,7,2,8,9,3,7,9,4,6,9,4,7,8,5,6,8,3,8,9,4,7, 9,5,6,9,5,7,8,2,9,10,3,8,10,4,7,10,4,8,9,5,6,10,5, 7,9,6,7,8,3]