Steam is related to Temperature. Temperature is related to Shade. Shade is related to Slight. 
Head is related to Shoulder. Shoulder is related to Part. Part is related to Cell. 
Steam <--RelatedTo--> Temperature <--RelatedTo--> Shade <--RelatedTo--> Slight 
Head <--RelatedTo--> Shoulder <--RelatedTo--> Part <--RelatedTo--> Cell 