private static readonly _SYMBOLIC_NAMES: Array<string | undefined> = [
        undefined, "COMMA", "LPAREN", "RPAREN", "IF_IN", "MUST_BE_IN", "IF_NOT_IN", 
        "MUST_NOT_BE_IN", "THEN", "AND", "OR", "PROGRAM_TYPES", "PROGRAM_TYPES_VALUE", 
        "PROGRAMS", "PLAN_TYPES", "COHORT_YEARS", "SUBJECT_YEARS", "SPECIAL", 
        "SPECIAL_VALUE", "COURSES", "SUBJECTS", "UNITS", "GPA", "COREQUISITE",