 c \\star d) ) = 0`,
          },
          {
            title: 'Keyboard Input: Placeholders',
            class: 'small',
            latex: `\\alpha^2+1+\\frac{#?}{#?}+\\sqrt{#?}-x^2_{a+1}=0`,
          },
          {
            title: 'Keyboard Input: Sub-expressions',
            class: 'small',
            latex: `1+ {(n+\\frac{123}{456})+\\sqrt{2n+1+(a*2)}}  - x^2_{a+1}=0`,
          },
          {
            title: 'Modulo',
            class: 'small',
            latex: `\\begin{aligned}
  \\exi