“…return True 39: end procedure 65. Some unstable challenges can be corrected by identifying and recoding the metastable states using the method in [110]. For example, the response quadruples {0, 0, X, 1} and {0, 0, 1, X} can be easily corrected to {0, 0, 1, 1} and the response quadruples {X, 1, 0, 0} and {1, X, 0, 0} can be easily corrected to {1, 1, 0, 0}.…”