Earlly Mac is an American rapper from Detroit, Michigan, who is best known for his collaborations with American rapper Big Sean. In 2010 he released his debut mixtape, "Party Up!". His debut EP, "God Knows", was released in January 2015, by Foolay Ent., LLC. The EP included the single "Do It Again" featuring Big Sean, which peaked at number 6 on the "Billboard" Twitter Emerging Artists chart.
Early Mac collaborated with Chance the rapper
I think the system found it difficult because we don't know for sure if the rapper collaborated with other artists or not. However We do know for sure he did collaborate with Big Sean.