040000 tree e910c08d9c97b8b9d90b254215395034598b32ce	11.7.1_The_Left_shift_Operator
040000 tree f7e8252f4955766282b54d0b148cc7ed2295aca5	11.7.2_The_Sign_Left_shift_Operator
040000 tree 5eef94ce40ee606b4f7ef726ac65298e62174457	11.7.3_The_Unsigned_Right_Shift_Operator