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

### Instruction:
Which player from GER has a transfer window of summer, and a transfer fee of n/a?

### Inputs:
table_name: table, columns: ['Nat.', 'Name', 'Type', 'Transfer window', 'Transfer fee']

### Response:
SELECT Name FROM table WHERE Transfer window = summer AND Nat. = ger AND Transfer fee = n/a