Fatigue is a type of Illness. Illness is related to Pill. Pill is related to Bottle. 
Click is a type of Depression. Dip is a type of Depression. Dip is related to Taste. Taste is related to Purpose. 
Fatigue --IsA--> Illness <--RelatedTo--> Pill <--RelatedTo--> Bottle 
Click --IsA--> Depression <--IsA-- Dip <--RelatedTo--> Taste <--RelatedTo--> Purpose 