Scratch is related to Writing. Writing requires Paper. Paper is related to Written. Written is related to Message. 
Review is a type of Remember. Remember is related to Try. Try is related to Test. 
Scratch <--RelatedTo--> Writing --HasPrerequisite--> Paper <--RelatedTo--> Written <--RelatedTo--> Message 
Review --IsA--> Remember <--RelatedTo--> Try <--RelatedTo--> Test 