user: Question: What is 17th c., when Initial-Syllable Open/Semi-Open Unstressed Vowels is "o /ɵ/"?
Columns: ['Initial-syllable open/semi-open unstressed vowels', '17th c.', 'American', 'British', 'Australian', 'Examples']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['a /ə/', 'ɐ', 'ə', 'ə', 'ə', 'papyrus, placebo, saliva, basilica']
SQL:

assistant: SELECT "17th c." FROM "Table" WHERE "Initial-syllable open/semi-open unstressed vowels" = 'o /ɵ/';