Improvement is related to Project. Project is related to Task. Task is a synonym of Tax. Tax is related to Revenue. 
Contain is related to Inside. Inside is related to Ear. Ear is related to Pair. 
Improvement <--RelatedTo--> Project <--RelatedTo--> Task <--Synonym--> Tax <--RelatedTo--> Revenue 
Contain <--RelatedTo--> Inside <--RelatedTo--> Ear <--RelatedTo--> Pair 