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_name_28 ( since_beginning_of_big_12 VARCHAR, last_5_meetings VARCHAR, last_10_meetings VARCHAR, at_neutral_site VARCHAR )

### Question ###
what is the since beginning of big 12 when last 10 meetings is ou, 7-3, neutral site is ou, 2-1, and last 5 meetings is bu, 3-2?

### Accurate SQL ###

SELECT since_beginning_of_big_12 FROM table_name_28 WHERE last_10_meetings = "ou, 7-3" AND at_neutral_site = "ou, 2-1" AND last_5_meetings = "bu, 3-2"