user: Who created the grading system for the I Liq Chuan martial art?

assistant: Sam F. S. Chin developed the grading system for the I Liq Chuan martial art.

user: What are the top three most popular collectible cardgames?

assistant: 1. Magic:  The Gathering
2. Pokemon
3. Yu-Gi-Oh!

user: Where do black walnut trees grow?

assistant: North America from southern Ontario, west to southeast South Dakota, south to Georgia, northern Florida and southwest to central Texas.