(define (main args)
  (let1 t (read)
        (do [(i t (- i 1))]
            [(zero? i)]
          (let* ([n (read)]
                 [x (read)]
                 [wa (quotient (* n (+ n 1)) 2)]
                 [d (- x wa)])
            (cond [(negative? d) (print -1)]
                  [else (do [(j 1 (+ j 1))]
                            [(= j n)]
                          (display j)
                          (display " "))
                        (print (+ n d))])
            )))
  0)