JOB = _(1..5);
TASK = _(1..5);
d = [| 1, 4, 5, 3, 6 
     | 3, 2, 7, 1, 2
     | 4, 4, 4, 4, 4  
     | 1, 1, 1, 6, 8
     | 7, 3, 2, 2, 1 |];