How many two-digit decimals less than 4 can be formed by using the numbers 2, 3, 4 and a decimal point.
用数字2、3、4和小数点可以组成多少个小于4的两位小数．
<gadget id="calculator">2 * 2 * 1</gadget>
<output>4</output>

<result>4</result>