Sodium is related to Salt. Salt is related to Tiny. 
Cell is related to Prisoner. Prisoner is related to Escape. Escape is related to Corner. Corner is the opposite of Center. 
Sodium <--RelatedTo--> Salt <--RelatedTo--> Tiny 
Cell <--RelatedTo--> Prisoner <--RelatedTo--> Escape <--RelatedTo--> Corner <--Antonym--> Center 