Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the maximum production code of an episode written by Patty Lin?

### Inputs:
table_name: table, columns: ['No(s). in series', 'No(s). in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code(s)', 'U.S. viewers (millions)']

### Response:
SELECT MAX Production code(s) FROM table WHERE Written by = Patty Lin