Darkness is related to Bat. Bat is related to Wooden. 
Fast is related to Dance. Dance is related to Related. Related is related to Weight. Weight is related to Characteristic. 
Darkness <--RelatedTo--> Bat <--RelatedTo--> Wooden 
Fast <--RelatedTo--> Dance <--RelatedTo--> Related <--RelatedTo--> Weight <--RelatedTo--> Characteristic 