Slot is a type of Status. Slot is a type of Position. Position is related to Servant. 
Certain is related to Opinion. Opinion is related to View. View is related to Hide. Hide is related to Mask. 
Status <--IsA-- Slot --IsA--> Position <--RelatedTo--> Servant 
Certain <--RelatedTo--> Opinion <--RelatedTo--> View <--RelatedTo--> Hide <--RelatedTo--> Mask 