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1aft = array1d(1..6, [{1, 2, 3, 4}, {1, 2, 3, 4}, {1, 3, 4}, {1, 3, 4}, {1, 3}, {}]);
2bef = array1d(1..6, [{}, {2, 4}, {1, 2, 4}, {1, 2, 3, 4}, {1, 2, 3, 4}, {1, 2, 3, 4}]);
3cost = 48;
4dur = array1d(1..6, [{2, 4}, {1, 2, 4}, {1, 3, 4}, {1, 3, 4}, {1, 3}, {1, 3}]);
5s = array1d(1..6, [4, 1, 2, 3, 6, 5]);
6----------
7==========