#One-In-Three 3SAT

    # Base case: all clauses are satisfied

    # Base case: conflicting assignment

    # Choose a variable to assign

    # Try assigning True to the variable

    # Try assigning False to the variable

    # Backtrack



    # Evaluate a single clause based on the given assignment





    # Choose an unassigned variable to assign




# Example usage

# Initialize the assignment dictionary


if __name__ == '__main__':
    def is_satisfiable(clauses, assignment):
        if all(evaluate_clause(clause, assignment) for clause in clauses):
            return True
        if any(evaluate_clause(clause, assignment) == False for clause in clauses):
            return False
        var = choose_variable(assignment)
        assignment[var] = True
        if is_satisfiable(clauses, assignment):
            return True
        assignment[var] = False
        if is_satisfiable(clauses, assignment):
            return True
        assignment[var] = None
        return False
    def evaluate_clause(clause, assignment):
        true_literals = 0
        for literal in clause:
            var, negated = abs(literal), literal < 0
            if assignment[var] == (not negated):
                true_literals += 1
        return true_literals == 1
    def choose_variable(assignment):
        for var, value in assignment.items():
            if value is None:
                return var
        return None
    clauses = [
        [1, 2, 3],
        [-1, -2, 4],
        [3, -4, -5],
        [-3, 5, 6]
    ]
    assignment = {1: None, 2: None, 3: None, 4: None, 5: None, 6: None}
    if is_satisfiable(clauses, assignment):
        print("Satisfiable: Yes")
        satisfying_assignment = {var: value for var, value in assignment.items() if value is not None}
        print("Satisfying assignment:", satisfying_assignment)
    else:
        print("Satisfiable: No")
