Explanation:
He added 8 to each number on the left column to get the number on the right column
So that
X 1, 2, 3, 4, 5, 6,
Y 1+8 = 9
Y 2 + 8 = 10
Y 3+8 = 11
Y 4 + 8 = 12
Y 5 + 8 = 13
Y 6 + 8 = 14
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