Figure 2.

[figure: ^{\underline{x}^{i}}; x_{i}; ^{\overline{x}^{i}}; w(x_{i} ∩ x̃_{i}); x_{i}; ^{˜\underline{x}^{i}}; x̃_{i}; ^{˜\overline{x}^{i}}; w \binom{}{x̃_{i}}]