Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_60998 ( "Semi-closed initial unstressed vowels" text, "17th c." text, "American" text, "Australian" text, "Examples" text )

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

### Accurate SQL ###

SELECT "Semi-closed initial unstressed vowels" FROM table_60998 WHERE "17th c." = 'ɐ'