Contain is related to Keep. Keep is related to Gate. Gate is a type of Supply. Bottom is a type of Supply. 
Skull is related to Mind. Mind is related to Calm. Calm is a synonym of Mild. 
Contain <--RelatedTo--> Keep <--RelatedTo--> Gate --IsA--> Supply <--IsA-- Bottom 
Skull <--RelatedTo--> Mind <--RelatedTo--> Calm <--Synonym--> Mild 