Event is related to Stroke. Stroke is a type of Score. 
Ear is related to Corn. Corn is related to Color. Color is related to Frequency. Frequency is the opposite of Period. 
Event <--RelatedTo--> Stroke --IsA--> Score 
Ear <--RelatedTo--> Corn <--RelatedTo--> Color <--RelatedTo--> Frequency <--Antonym--> Period 