Define A◎B to represent the sum of all odd numbers between A and B, for example, 12◎7=9+11=20, calculate (2◎10)◎19=how much.
定义A◎B表示A、B之间所有奇数的和，例如12◎7=9+11=20，计算(2◎10)◎19=多少．
<gadget id="calculator">21 + 23</gadget>
<output>44</output>

<result>44</result>