What are some pure sativa strains of marijuana?

There’s 2 different groups in marijuana, Indica and Sativa. Each provides a different affect. Can you please list all 100% Sativa weeds, or at least mostly sativa. Because Indica and Sativa tend to be mixed a lot of the time, either 50/50 or something like 80/20.

Please list your source if you have one too, thank you.