Harmony is related to Sing. Sing is related to Opera. you are likely to find Opera in/at/on Theater. 
Number is related to Average. Average is a synonym of Typical. Typical is related to Dog. 
Harmony <--RelatedTo--> Sing <--RelatedTo--> Opera --AtLocation--> Theater 
Number <--RelatedTo--> Average <--Synonym--> Typical <--RelatedTo--> Dog 