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

### Instruction:
What is 17th c., when Initial-Syllable Open/Semi-Open Unstressed Vowels is "o /ɵ/"?

### Inputs:
table_name: table, columns: ['Initial-syllable open/semi-open unstressed vowels', '17th c.', 'American', 'British', 'Australian', 'Examples']

### Response:
SELECT 17th c. FROM table WHERE Initial-syllable open/semi-open unstressed vowels = o /ɵ/