code: function changeDuplicateAreaSelectors (ruleSelectors, templateSelectors) {
    ruleSelectors = ruleSelectors.map(selector => {
      let selectorBySpace = list.space(selector)
      let selectorByComma = list.comma(selector)
  
      if (selectorBySpace.length > selectorByComma.length) {
        selector = selectorBySpace.slice(-1).join('')
      }
      return selector
    })
  
    return ruleSelectors.map(ruleSelector => {
      let newSelector = templateSelectors.map((tplSelector, index) => {
        let space = index === 0 ? '' : ' '
        return `${ space }${ tplSelector } > ${ ruleSelector }`
      })
  
      return newSelector
    })
  }
docs: change selectors for rules with duplicate grid-areas.
  @param  {Array<Rule>} rules
  @param  {Array<String>} templateSelectors
  @return {Array<Rule>} rules with changed selectors