Item 1 (0C7N)—The Stacks project

are given by

\[ \left( \begin{matrix} m_1 \\ m_2 \end{matrix} \right), \quad \left( \begin{matrix} -2w & w \\ w & -2w \end{matrix} \right), \quad \left( \begin{matrix} w \\ w \end{matrix} \right) \]

with $w$ arbitrary and $2m_1 \geq m_2$ and $2m_2 \geq m_1$, or

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