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_10 ( transfer_fee VARCHAR, moving_from VARCHAR, nat VARCHAR )

### Question ###
Which Transfer fee has a Moving from of youth system, and a Nat of mar?

### Accurate SQL ###

SELECT transfer_fee FROM table_name_10 WHERE moving_from = "youth system" AND nat = "mar"