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_12 (previous_team VARCHAR, pick VARCHAR, nba_years_ VARCHAR, a_ VARCHAR)

### Question ###
What is the previous team of the player with 4 NBA years and a pick less than 16?

### Accurate SQL ###

SELECT previous_team FROM table_name_12 WHERE nba_years_[a_] = "4" AND pick < 16