Commit is a synonym of Invest. Invest is a type of Spend. 
Mathematics is related to Physics. you are likely to find Physics in/at/on University. you are likely to find Debate in/at/on University. Debate is a synonym of Contend. 
Commit <--Synonym--> Invest --IsA--> Spend 
Mathematics <--RelatedTo--> Physics --AtLocation--> University <--AtLocation-- Debate <--Synonym--> Contend 