Rat is a type of Pad. Pad can be used for Mouse. Mouse is related to Tail. Tail is related to Bottom. 
Introduce is related to Bring. Bring is related to Trailer. 
Rat --IsA--> Pad --UsedFor--> Mouse <--RelatedTo--> Tail <--RelatedTo--> Bottom 
Introduce <--RelatedTo--> Bring <--RelatedTo--> Trailer 