Explain is related to Discuss. Discuss is related to Debate. one thing you do when you Disagree is Debate. 
Profession is related to Farmer. Farmer is related to Plant. Plant is related to Rice. 
Explain <--RelatedTo--> Discuss <--RelatedTo--> Debate <--HasSubevent-- Disagree 
Profession <--RelatedTo--> Farmer <--RelatedTo--> Plant <--RelatedTo--> Rice 