Offer is related to Invitation. Invitation is related to Accept. Welcome is a type of Accept. 
Rice is related to Agricultural. Agricultural is related to Crop. Crop is related to Proper. Proper is related to Manner. 
Offer <--RelatedTo--> Invitation <--RelatedTo--> Accept <--IsA-- Welcome 
Rice <--RelatedTo--> Agricultural <--RelatedTo--> Crop <--RelatedTo--> Proper <--RelatedTo--> Manner 