Photo is related to Crop. Crop is related to Supply. Offer is a type of Supply. Offer is related to Invitation. 
Condition is a type of Premise. Condition is related to Case. Case is a type of Fact. Fact is a type of Reality. 
Photo <--RelatedTo--> Crop <--RelatedTo--> Supply <--IsA-- Offer <--RelatedTo--> Invitation 
Premise <--IsA-- Condition <--RelatedTo--> Case --IsA--> Fact --IsA--> Reality 