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Logic Level 3

\[ \begin{eqnarray} && 1 \\ && 11 \\ && 21 \\ && 1211 \\ && 111221 \\ && 312211 \\ && 13112221 \\ && 1113213211 \\ && ? \end{eqnarray} \]

Above shows a sequence of integers that follow a certain pattern. What number can replace the question mark?

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