       title: 'Array with Vertical Lines',
            comment: 'Single, double and dashed separator lines',
            latex: `\\begin{array}{c|c||c:c}
                1 & 2 & a & \\alpha \\\\
                3 & 4 & b & \\beta +1 \\\\
                5 & 6 & \\sin x + \\cos y & \\alpha + \\beta + 1 \\\\
                5 & 6 & c & \\cos(\\theta + \\pi) \\\\
            \\end{array}}`,
          },
          {
            title: 'Array with Horizontal Lines',
            pic: 'array-with-lines.gif',
     