Post is related to Latin. Latin can be Language. Language is related to Written. 
Constant is the opposite of Variable. Vary is derived from Variable. Vary is related to Difference. Difference is related to Finding. 
Post <--RelatedTo--> Latin --HasProperty--> Language <--RelatedTo--> Written 
Constant <--Antonym--> Variable <--DerivedFrom-- Vary <--RelatedTo--> Difference <--RelatedTo--> Finding 