m=240 r=30 b<2^12: max trapped steps on a surviving path, top 12 (steps, total trapped vertices, b):
(3, 7, 3391)
(2, 6, 2757)
(2, 6, 2409)
(2, 6, 1485)
(2, 6, 919)
(2, 6, 803)
(2, 6, 495)
(2, 6, 165)
(2, 6, 55)
(2, 5, 3681)
(2, 5, 3617)
(2, 5, 1227)
histogram: [(0, 1844), (1, 187), (2, 16), (3, 1)]
