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

### Instruction:
What is the Interregnum ended for the person with a Duration of 3 months, 6 days?

### Inputs:
table_name: table, columns: ['Interregnum began', 'Interregnum ended', 'Duration', 'Count Palatine of Saxony', 'Count Palatine of the Rhine']

### Response:
SELECT Interregnum ended FROM table WHERE Duration = 3 months, 6 days