The two inner terms of a ratio are the smallest prime number and composite number, and the two outer terms are 1 and x.
一个比例的两个内项分别是最小的质数和合数，两个外项分别是1和x．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<result>8</result>