Alien is related to Illegal. Illegal is related to Crime. Crime is related to Motive. 
Ballot is related to Butterfly. Butterfly is related to Flying. Flying is related to Angel. Angel is a type of River. 
Alien <--RelatedTo--> Illegal <--RelatedTo--> Crime <--RelatedTo--> Motive 
Ballot <--RelatedTo--> Butterfly <--RelatedTo--> Flying <--RelatedTo--> Angel --IsA--> River 