China and Japan are playing a Go arena match, and each side has 5 super-class players, who will play in the order arranged in advance. The two sides first compete with player No. 1, the loser is eliminated, and the winner continues to compete with the opponent's No. 2 player, ... until one player is all eliminated, and the other side wins, thus forming a game process. How many kinds of all possible game processes are there?
中、日双方进行围棋擂台赛，双方各出5名超一流棋手，按事先排好的顺序出场比赛．双方先由1号棋手比赛，负者被淘汰，胜者继续与对方2号棋手比赛，…，直到有一方队员全部被淘汰为止，另一方获胜，这样形成一个比赛过程．所有可能出现的比赛过程共有多少种．
<gadget id="calculator">1 + 5 + 15 + 35 + 70</gadget>
<output>126</output>

<gadget id="calculator">126 * 2</gadget>
<output>252</output>

<result>252</result>