IF = 'if'
EQUALS = 'equals'
GREATER = 'greater'
LOWER = 'lower'
MINUS = 'minus'
PLUS = 'plus'
MUL = 'mul'
DIV = 'div'
PLAYER = 'player'
PLAYER_X_SCORE = 'getScoreOfPlayerX'
PLAYER_O_SCORE = 'getScoreOfPlayerO'
PLAYER_SCORE = 'getScoreOfPlayer'
EMPTY = 'empty'
PLAYER_X = 'X'
PLAYER_O = 'O'