3*7=21, 33*67=2211, 333*667=222111, so how much is 3333*6667=
3*7=21，33*67=2211，333*667=222111，那么3333*6667=多少
<gadget id="calculator">3_333 * 6_667</gadget>
<output>22_221_111</output>

<result>22_221_111</result>