Sigh is related to Love. Love is related to People. Enemy is a type of People. 
Condition is related to Ill. Ill is a synonym of Ugly. Ugly is related to Bad. Bad is related to Depression. 
Sigh <--RelatedTo--> Love <--RelatedTo--> People <--IsA-- Enemy 
Condition <--RelatedTo--> Ill <--Synonym--> Ugly <--RelatedTo--> Bad <--RelatedTo--> Depression 