Case is related to File. File is a type of Record. Record is related to Disk. Disk can be used for Throw. 
Buy is related to Cash. Cash is related to Payment. Payment is related to Scheme. 
Case <--RelatedTo--> File --IsA--> Record <--RelatedTo--> Disk --UsedFor--> Throw 
Buy <--RelatedTo--> Cash <--RelatedTo--> Payment <--RelatedTo--> Scheme 