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

### Instruction:
Which PD per game has a Rank smaller than 4, a Winning % of 78.6%, a Streak of w1, and a PA per game smaller than 81.5?

### Inputs:
table_name: table, columns: ['Rank', 'Team', 'Played', 'Loss', 'Last 5', 'Streak', 'PF per game', 'PA per game', 'PD per game', 'Winning %']

### Response:
SELECT MIN PD per game FROM table WHERE Rank < 4 AND Winning % = 78.6% AND Streak = w1 AND PA per game < 81.5