Dear is related to Address. Address is a synonym of Reference. Reference is a synonym of Mention. 
you are likely to find Shade in/at/on Park. Shade is related to Protection. Army can be used for Protection. 
Dear <--RelatedTo--> Address <--Synonym--> Reference <--Synonym--> Mention 
Park <--AtLocation-- Shade <--RelatedTo--> Protection <--UsedFor-- Army 