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_78604 ( "Letter" text, "Pronunciation spelled free" text, "Pronunciation spelled checked" text, "Example spelled free" text, "Example spelled checked" text )

### Question ###
What is Pronunciation Spelled Free, when Pronunciation Spelled Checked is ' '?

### Accurate SQL ###

SELECT "Pronunciation spelled free" FROM table_78604 WHERE "Pronunciation spelled checked" = 'ʏ'