X 1 t 2t 2

X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2
X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2
X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2X 1 t 2t 2