Card is related to Unit. Unit is related to Colony. Colony is related to Early. Early is similar to Future. 
Signal is related to Turn. one thing you do when you Driving is Turn. Driving requires Car. Car is related to Lemon. 
Card <--RelatedTo--> Unit <--RelatedTo--> Colony <--RelatedTo--> Early <--SimilarTo--> Future 
Signal <--RelatedTo--> Turn <--HasSubevent-- Driving --HasPrerequisite--> Car <--RelatedTo--> Lemon 