Pencil is related to Line. Line is related to River. 
Fall is a synonym of Spill. Spill is a type of Slip. Slip is related to Cause. Cause is related to Initial. 
Pencil <--RelatedTo--> Line <--RelatedTo--> River 
Fall <--Synonym--> Spill --IsA--> Slip <--RelatedTo--> Cause <--RelatedTo--> Initial 