Diary is related to Date. Date is related to Love. Love would make you want to Help. 
Desert is related to Death. Death is the opposite of Birthday. Birthday is related to Origin. 
Diary <--RelatedTo--> Date <--RelatedTo--> Love --CausesDesire--> Help 
Desert <--RelatedTo--> Death <--Antonym--> Birthday <--RelatedTo--> Origin 