Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Who was the EP winning team when the CP winning team was Dave Clark and the GM winning team was Stuart Northrup?

### Inputs:
table_name: table, columns: ['Rnd', 'Circuit', 'AP Winning Team', 'BP Winning Team', 'CM Winning Team', 'CP Winning Team', 'DM Winning Team', 'DP Winning Team', 'EM Winning Team', 'EP Winning Team', 'FM Winning Team', 'FP Winning Team', 'GM Winning Team', 'GP Winning Team', 'HM Winning Team', 'HP Winning Team', 'Results']

### Response:
SELECT EP Winning Team FROM table WHERE CP Winning Team = Dave Clark AND GM Winning Team = Stuart Northrup