Nation is related to Place. Place is related to Desert. 
Cottage is related to Farm. Farm is related to Cow. Cow is a different concept from Chicken. Chicken is related to Head. 
Nation <--RelatedTo--> Place <--RelatedTo--> Desert 
Cottage <--RelatedTo--> Farm <--RelatedTo--> Cow <--DistinctFrom--> Chicken <--RelatedTo--> Head 