old_contents: module.exports = [
      {action: '\\sqrt', label: '\\sqrt{X}'},
      {action: '^', label: 'X^{X}'},
      {action: '\\frac', label: '\\frac{X}{X}'},
      {action: '\\int', label: '\\int_{X}^{X}'},
      {action: '\\neq', label: '\\neq'},
      {action: '\\lim_', label: '\\lim_{X}'},
      {action: '\\to', label: '\\to'},
      {action: '\\overrightarrow', label: '\\overrightarrow{X}'},
      {action: '_', label: 'X_X'},
      {action: '\\nthroot', label: '\\sqrt[X]{X}'},
      {action: '\\sum'},
      {action: '\\binom', label: '\\binom{X}{X}'},
      {action: '\\sin'},
      {action: '\\cos'},
      {action: '\\tan'},
      {action: '\\arcsin'},
      {action: '\\arccos'},
      {action: '\\arctan'},
      {action: '\\le'},
      {action: '\\ge'},
      {action: '\\approx'},
      {action: '\\not'},
      {action: '\\pm'},
      {action: '\\in'},
      {action: '\\ni'},
      {action: '\\cdot'},
      {action: '\\parallel'},
      {action: '\\pi'},
      {action: '\\vec', label: '\\vec{X}'},
      {action: '\\bar', label: '\\bar{X}'},
      {action: '\\overleftarrow', label: '\\overleftarrow{X}'},
      {action: '\\hat', label: '\\hat{X}'},
  ]
  
new_contents: module.exports = [
      { action: '\\sqrt', label: '\\sqrt{X}' },
      { action: '^', label: 'X^{X}' },
      { action: '\\frac', label: '\\frac{X}{X}' },
      { action: '\\int', label: '\\int_{X}^{X}' },
      { action: '\\neq', label: '\\neq' },
      { action: '\\lim_', label: '\\lim_{X}' },
      { action: '\\to', label: '\\to' },
      { action: '\\overrightarrow', label: '\\overrightarrow{X}' },
      { action: '_', label: 'X_X' },
      { action: '\\nthroot', label: '\\sqrt[X]{X}' },
      { action: '\\sum', label: '\\sum_{X}^{X}' },
      { action: '\\binom', label: '\\binom{X}{X}' },
      { action: '\\sin' },
      { action: '\\cos' },
      { action: '\\tan' },
      { action: '\\arcsin' },
      { action: '\\arccos' },
      { action: '\\arctan' },
      { action: '\\le' },
      { action: '\\ge' },
      { action: '\\approx' },
      { action: '\\not' },
      { action: '\\pm' },
      { action: '\\in' },
      { action: '\\ni' },
      { action: '\\cdot' },
      { action: '\\parallel' },
      { action: '\\pi' },
      { action: '\\vec', label: '\\vec{X}' },
      { action: '\\bar', label: '\\bar{X}' },
      { action: '\\underline', label: '\\underline{X}' },
      { action: '\\overleftarrow', label: '\\overleftarrow{X}' },
      { action: '\\times' },
      { action: '\\mp' },
      { action: '\\notin' },
      { action: '\\div' },
      { action: '\\subset' },
      { action: '\\cap' },
      { action: '\\cup' },
      { action: '\\equiv' },
      { action: '\\sim' },
      { action: '\\cong' },
      { action: '\\infty' },
      { action: '\\varnothing' },
      { action: '\\pi' },
      { action: '\\wedge' },
      { action: '\\vee' },
      { action: '\\forall' },
      { action: '\\exists' },
      { action: '\\nexists' },
      { action: '\\angle' },
      { action: '\\bot' },
      { action: '\\triangle' },
      { action: '\\leftarrow' },
      { action: '\\Leftarrow' },
      { action: '\\rightarrow' },
      { action: '\\Rightarrow' },
      { action: '\\Leftrightarrow' },
      { action: '\\uparrow' },
      { action: '\\downarrow' },
      { action: '\\circ' },
      { action: '\\setminus' }
  ]
  
subject: Add more symbols to editor