It takes 6 seconds for the clock to strike 4 times at 4 o'clock, and how many seconds does it take for the clock to strike 6 times at 6 o'clock.
时钟4时敲4下用6秒，6时敲6下用多少秒秒．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>