This setup works for multiple button presses if you use the boolean operation AND. Button() is a binary number where each position is a button. ANDing that with a button ID (think binary) will match if both have a 1 in the same position.
You can do mulitples by introducing OR. 01 OR 10 is 11 because there is a 1 in one OR the other of the numbers.
So:
IF BUTTON() AND (#A OR #X) THEN
1そうだね プレイ済み