CREATE TABLE table_7506 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Location" CLOB, "Record" CLOB, "Attendance" CLOB)

Who was the opponent in the game played after Week 4 on October 15, 2000?
SELECT "Opponent" FROM table_7506 WHERE "Week" > '4' AND "Date" = 'october 15, 2000'
SELECT "Opponent" FROM "table_7506" WHERE "Date" = 'october 15, 2000' AND "Week" > '4'