Iteration 0: [1.0, 0.0, 0.0, 0.0] position: 0
Iteration 1: [0.0, 1.0, 0.0, 0.0] position: 1
Iteration 2: [0.0, 0.0, 0.0, 1.0] position: 3
Iteration 3: [0.0, 0.0, 0.0, 0.0] position: -1
iter check failed
pbt result: [3, 3, 3, 3]
pbt check failed
