user: What are different types of grass?

assistant: There are more than 12,000 species of grass. The most common is Kentucky Bluegrass, because it grows quickly, easily, and is soft to the touch. Rygrass is shiny and bright green colored. Fescues are dark green and shiny. Bermuda grass is harder but can grow in drier soil.

user: How long did it take for ironworking to be commonplace in West Africa following its introduction in Northern Africa?

assistant: Ironworking was introduced in Northern Africa around the first millennium BCE and became commonplace in West Africa by 500 BCE. This means it took 500 years (1000-500) for ironworking to become common in West Africa following its introduction in Northern Africa.

user: From the passage list down the location of Visa data centers. List the results in semi colon separated format.

assistant: Ashburn, Virginia; Highlands Ranch, Colorado; London, England; Singapore