code: func (v *VerbalExpression) Range(args ...interface{}) *VerbalExpression {
  	if len(args)%2 != 0 {
  		log.Panicf("Range: not even args number")
  	}
  
  	parts := make([]string, 3)
  	app := ""
  	for i := 0; i < len(args); i++ {
  		app += tostring(args[i])
  		if i%2 != 0 {
  			parts = append(parts, quote(app))
  			app = ""
  		} else {
  			app += "-"
  		}
  	}
  	return v.add("[" + strings.Join(parts, "") + "]")
  }
docs: // Range accepts an even number of arguments. Each pair of values defines start and end of range.
  // Think like this: Range(from, to [, from, to ...])