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





