Opera is related to Art. Art is related to General. General is related to Veteran. Veteran is related to Military. 
Dancer is related to Movement. Movement is related to Pass. Pass is related to Class. Class is a type of Collection. 
Opera <--RelatedTo--> Art <--RelatedTo--> General <--RelatedTo--> Veteran <--RelatedTo--> Military 
Dancer <--RelatedTo--> Movement <--RelatedTo--> Pass <--RelatedTo--> Class --IsA--> Collection 