CREATE TABLE table_49583 ("Nat." CLOB, "Name" CLOB, "Moving to" CLOB, "Type" CLOB, "Transfer window" CLOB, "Transfer fee" CLOB, "Source" CLOB)

What is the Nat with a mutual consent loan return and has a free transfer fee?
SELECT "Nat." FROM table_49583 WHERE "Transfer fee" = 'free' AND "Type" = 'mutual consent loan return'
SELECT "Nat." FROM "table_49583" WHERE "Transfer fee" = 'free' AND "Type" = 'mutual consent loan return'