Fog is related to Morning. Morning is related to Bright. Bright is related to Toy. 
Diagnosis is related to Ill. Ill is similar to Upset. Pain is a type of Upset. Breathing can cause/lead to Pain. 
Fog <--RelatedTo--> Morning <--RelatedTo--> Bright <--RelatedTo--> Toy 
Diagnosis <--RelatedTo--> Ill <--SimilarTo--> Upset <--IsA-- Pain <--Causes-- Breathing 