Equal is a type of Powder. Equal is similar to Level. Level is related to Indicator. 
Study is related to Experiment. Experiment is related to Lab. Lab is related to Doctor. Resident is a type of Doctor. 
Powder <--IsA-- Equal <--SimilarTo--> Level <--RelatedTo--> Indicator 
Study <--RelatedTo--> Experiment <--RelatedTo--> Lab <--RelatedTo--> Doctor <--IsA-- Resident 