Offer is related to Give. Give is the opposite of Bring. 
Building is related to Door. Door is related to Type. Type is related to Slip. Fall requires Slip. 
Offer <--RelatedTo--> Give <--Antonym--> Bring 
Building <--RelatedTo--> Door <--RelatedTo--> Type <--RelatedTo--> Slip <--HasPrerequisite-- Fall 