Item 2 (0C7P)—The Stacks project

are given by

$\left( \begin{matrix} m_1 \\ m_2 \end{matrix} \right), \quad \left( \begin{matrix} -2w & 2w \\ 2w & -4w \end{matrix} \right), \quad \left( \begin{matrix} w \\ 2w \end{matrix} \right)$

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

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