Fatigue is similar to Strain. Strain is a type of Disease. Disease is related to Bad. Bad is similar to Negative. 
Pressure is related to Peer. Peer is related to Equal. Equal is related to Comparable. 
Fatigue <--SimilarTo--> Strain --IsA--> Disease <--RelatedTo--> Bad <--SimilarTo--> Negative 
Pressure <--RelatedTo--> Peer <--RelatedTo--> Equal <--RelatedTo--> Comparable 