| behavior | input | output |
|---|---|---|
| Determine whether number is divisible by 15 | 15 | [1, 2, "ping", 4, "pong", "ping", 7, 8, "ping", "pong", 11, "ping", 13, 14, "pingpong"] |
| Determine if number is divisible by 5 | 5 | [1, 2, "ping", 4, "pong"] |
| Determine if number is divisible by 3 | 3 | [1, 2, "ping"] |
| Return number if number is not divisible by 3 or 5 | 7 | 7 |