table     X -> Y                             groups broken  verdict
Flat      cust_id -> cust_name                           0  holds
Flat      cust_id -> phone                               0  holds
Flat      svc_id -> price                                0  holds
Flat      Outlet_id -> outlet_name                       0  holds
Flat      cust_name -> cust_id                           3  FAILS
Flat      phone -> cust_id                               0  holds
Flat      svc_id,unit -> payment                        15  FAILS
Flat      svc_id,unit -> payment                         0  holds  (filtered)
Flat      Outlet_id,rack -> bill                         0  holds  (filtered)
Employee  email -> id                                    0  holds

One counter-example for cust_name -> cust_id:
   ('Hana Chandra', 'C0109,C0104')
