d{array}`,
          },
          {
            title: 'Nested mode shifts and set: <kbd>$</kbd> and <kbd>$$</kbd>',
            comment:
              'In TeX the $$ inside text is an error, only $ is allowed (and not by all TeX implementation)',
            latex: `\\text{A $\\frac12$$\\frac34$$ \\frac56$}`,
          },
        ],
        'Layout (spacing)': [
          {
            title: 'Spacing',
            comment: ['space around the "op", but not before or after the "+"'],
            latex: '-\\