Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT transfer_fee FROM table_name_10 WHERE moving_from = "youth system" AND nat = "mar"