markRegionV = function () {
    let rv = this.string.length

    if (rv > 3) {
      if (!this.hasVowelAtIndex(1)) {
        rv = this.nextVowelIndex(2) + 1
      } else if (this.hasVowelAtIndex(0) && this.hasVowelAtIndex(1)) {
        rv = this.nextConsonantIndex(2) + 1
      } else {
        rv = 3
      }
    }

    return rv
  }
Mark RV.

@param  {Object} token Token to stem.
@return {Number}       Region start index.