+-------------+ +------------------+ 
| Products    | | Supplier_Product | 
+-------------+ +------------------+
| PNO | PNAME | | SNO     | PNO    |
+-----+-------+ +---------+--------+
| P1  | Screw | | S1      | P1     | 
| P1  | Screw | | S1      | P1     | 
| P1  | Screw | | S1      | P2     | 
| P2  | Screw | +------------------+ 
+-------------+