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

### Instruction:
For the 17th century entry of ɐ, what is Semi-closed initial unstressed vowels?

### Inputs:
table_name: table, columns: ['Semi-closed initial unstressed vowels', '17th c.', 'American', 'Australian', 'Examples']

### Response:
SELECT Semi-closed initial unstressed vowels FROM table WHERE 17th c. = ɐ