The sizing of the bracket-to-expression ratio does not change in any way. Since &quot; left &quot; and &quot; right &quot; ensure unique assignment of the brackets, every single bracket can be used as an argument for these two commands, even placing right brackets on the left side, or left brackets on the right. Instead of a bracket you can use the &quot; none &quot; qualifier, which means that there is no bracket shown and that there is no space reserved for a bracket. Using this, you can create the following expressions:
由于 &quot; left &quot; 和 &quot; right &quot; 保证了括号间的明确对应关系，每个括号都可以用作这两者的自变量，包括可以将右括号放在左边或把左括号放在右边。也可用 &quot; none &quot; 取代括号位置，这就意味着，在该位置不显示括号，并且也没有为括号预留位置。这样便会构成如下表达式：