\(G\left( {\dfrac{{{x_A} + {x_B} + {x_C} + {x_D}}}{3};\dfrac{{{y_A} + {y_B} + {y_C} + {y_D}}}{3};\dfrac{{{z_A} + {z_B} + {z_C} + {z_D}}}{3}} \right)\)

\(G\left( {\dfrac{{{x_A} + {x_B} + {x_C} + {x_D}}}{4};\dfrac{{{y_A} + {y_B} + {y_C} + {y_D}}}{4};\dfrac{{{z_A} + {z_B} + {z_C} + {z_D}}}{4}} \right)\)

\(G\left( {\dfrac{{{x_A} + {x_B} + {x_C} + {x_D}}}{2};\dfrac{{{y_A} + {y_B} + {y_C} + {y_D}}}{2};\dfrac{{{z_A} + {z_B} + {z_C} + {z_D}}}{2}} \right)\)

\(G\left( {\dfrac{{{x_A} + {x_B} - {x_C} + {x_D}}}{4};\dfrac{{{y_A} + {y_B} - {y_C} + {y_D}}}{4};\dfrac{{{z_A} - {z_B} + {z_C} + {z_D}}}{4}} \right)\)