In the above analyses, we assume that every time an opinion for an additional DP with an additional zone axis is fused with another, and the additional zone axis is one that has not been used before (Condition 3), which will not always be true in real experiments. To test the robustness of the method to repeatedly fusing opinions for the same zone axis, we duplicated the original candidate pool. Thus, when multiple DPs are randomly sampled from the pool for opinion fusion, it is possible that the same DPs are repeatedly fused. The number of duplicates varies from 2 to 5. The data show that the accuracy does not decrease if the candidate pool is duplicated ≤ 5 times Fig. "Repetition 0 -2 -3 -4 -5").