s & 0 \\\\ \\vdots & \\ddots & \\vdots \\\\ 0 & \\cdots & 0 \\end{bmatrix}`,
          },
          {
            title: 'A rule inside a matrix',
            latex: `\\begin{matrix}=\\rule{5em}{3em}\\end{matrix}`,
          },
          {
            title: 'Matrix with infix',
            comment:
              '<kbd>d</kbd> should be in a separate column, not in the infix command',
            latex: `\\begin{matrix} a \\choose b c & d \\end{matrix}`,
          },
          {
            title: 'Array wi