\[ \begin{array} { c c c c c }
\square & + & \square & = & \square \\
\square & + & \square & = & \square \\
\square & + & \square & = & \square \\
\square & + & \square & = & \square \\
\square & + & \square & = & \square \\
\square & + & \square & = & \square \\

\end{array} \]
Is it possible to fill the above squares with all the integers from 1 to 18 (using each number only once), such that each equation holds true?

For example, if we had only 4 rows and 12 numbers from 1 to 12 available, we could do the following:

\[ \begin{array} { c c c c c }
1 &+& 6 & =& 7 \\
2 &+& 10 & =& 12 \\
3 &+& 8 & =& 11 \\
4 &+& 5 & =& 9.
\end{array} \]

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