Table: league_manager_changes_6
Columns: team
outgoing_manager
manner_of_departure
date_of_vacancy
replaced_by
position_in_the_table

Question: Tell me the outgoing manager for resigned and replaced by manolo villanova for real zaragoza
SQL: SELECT "outgoing_manager" FROM league_manager_changes_6 WHERE "manner_of_departure" = 'resigned' AND "team" = 'real zaragoza' AND "replaced_by" = 'manolo villanova'

Question: Name the replaced by for racing santander
SQL: SELECT "replaced_by" FROM league_manager_changes_6 WHERE "team" = 'racing santander'