In a deck of playing cards (the big and small kings have been drawn), at least how many cards must be taken out to ensure that there are at least 4 cards of a certain suit.
在一副扑克牌中(大小王已被抽出)，至少拿出多少张，才能保证某一种花色的牌至少有4张．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>