Match the type of defects in Column I with the corresponding metal manufacturing processes listed in Column II.
| Column I | Column II |
|---|
| (P) Edge Cracking | (1) Casting |
| (Q) Flashline Cracking | (2) Forging |
| (R) Chevron Cracking | (3) Rolling |
| (S) Cracked Core | (4) Extrusion |