Here is a Python program that outputs "Hello World" and demonstrates how to join a list of strings:
```py
print("Hello World")

mac = ["02", "02", "84", "6A", "96", "00"]
print(":".join(mac))
# Outputs 02:02:84:6A:96:00
```
spam fails_task pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence