B

$C{O}_{\beta }^{\alpha }$

$N{E}_{\beta }^{\alpha }$

$A{L}_{\beta }^{\alpha }$

x₁

$\left\{x_2,x_3,x_4,x_5\right\}$

$\left\{x_6\right\}$

$\left\{x_1\right\}$

x₂

$\left\{x_1\right\}$

$\left\{x_6\right\}$

$\left\{x_2,x_3,x_4,x_5\right\}$

x₃

$\left\{x_1\right\}$

$\left\{x_4\right\}$

$\left\{x_2,x_3,x_5,x_6\right\}$

x₄

$\left\{x_1,x_6\right\}$

$\left\{x_3\right\}$

$\left\{x_2,x_4,x_5\right\}$

x₅

$\left\{x_1\right\}$

$\left\{x_6\right\}$

$\left\{x_2,x_3,x_4,x_5\right\}$

x₆

$\left\{x_4\right\}$

$\left\{x_1,x_2,x_5\right\}$

$\left\{x_3,x_6\right\}$