1cost = 48; 2s = [4, 1, 2, 3, 6, 5]; 3dur = [{2, 4}, {1, 2, 4}, {1, 3, 4}, {1, 3, 4}, {1, 3}, {1, 3}]; 4bef = [{}, {2, 4}, {1, 2, 4}, 1..4, 1..4, 1..4]; 5aft = [1..4, 1..4, {1, 3, 4}, {1, 3, 4}, {1, 3}, {}]; 6a = [1..2, 2..3, 3..4, {2, 4}, {1, 3}, {1, 4}]; 7---------- 8==========