flow.size: 8
row.1: 3,0,0,0,0,0,0,0
row.2: 4,0,0,0,0,0,6,0
row.3: 1,0,0,0,0,0,5,2
row.4: 0,0,0,0,0,0,7,6
row.5: 0,0,0,0,0,0,0,0
row.6: 1,4,0,0,0,5,0,0
row.7: 3,0,0,0,0,7,0,0
row.8: 2,0,0,0,0,0,0,0







