X k a 1 2

X k a 1 2X k a 1 2X k a 1 2X k a 1 2
X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2
X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2X k a 1 2