Update Tic_Tac_Toe.mp

models/Application_examples/Tic_Tac_Toe.mp

@@ -175,10 +175,10 @@ DO
 OD;
 COORDINATE $second_move:
  (
-     	O_chooses_remnant_next_to_X_on_first_turn           |
+      O_chooses_remnant_next_to_X_on_first_turn           |
       O_chooses_remnant_NOT_beside_an_X_on_first_turn       |
-     	O_chooses_corner	                                      |
-     	O_chooses_center
+      O_chooses_corner                                        |
+      O_chooses_center
  )
 DO
 	ADD SAY("SECOND MOVE OF THE GAME.") PRECEDES $second_move;