Testimony is part of Trial. Trial is related to Drama. Drama is related to Theater. Theater is related to Debut. 
Disc is related to Contact. Contact is a type of Book. Chamber is a type of Book. 
Testimony --PartOf--> Trial <--RelatedTo--> Drama <--RelatedTo--> Theater <--RelatedTo--> Debut 
Disc <--RelatedTo--> Contact --IsA--> Book <--IsA-- Chamber 