93. Class 1 and Class 2 each send out 4 players to compete in a table tennis singles match according to a pre-arranged order. Both sides start with the No. 1 player. The loser is eliminated, and the winner competes against the No. 2 player of the losing side, ... until all players on one side are eliminated, at which point the other side wins. The number of matches from the first match to the final determination of the winner, and the outcome of each match, is called a match process. Therefore, the number of possible match processes is $\qquad$ kinds.
answer: 70