CREATE TABLE table_51606 ("Entrant" CLOB, "Constructor" CLOB, "Chassis" CLOB, "Engine" CLOB, "Tyre" CLOB, "Driver" CLOB, "Rounds" CLOB)

What engine did Riccardo Patrese use?
SELECT "Engine" FROM table_51606 WHERE "Driver" = 'riccardo patrese'
SELECT "Engine" FROM "table_51606" WHERE "Driver" = 'riccardo patrese'