"""expression : NOT_OP expression"""
p[0] = ('NOT', p[2])
+def p_expression_or_or(p):
+ """expression : expression OR_OP OR_OP expression"""
+ p[0] = ('OR', p[1], p[4])
+
def p_expression_or(p):
"""expression : expression OR_OP expression"""
p[0] = ('OR', p[1], p[3])