Operation is related to Cell. Cell is related to Space. you are likely to find Gas in/at/on Space. Gas is related to American. 
Outer is related to Moon. Moon is related to Face. Eyebrow is part of Face. 
Operation <--RelatedTo--> Cell <--RelatedTo--> Space <--AtLocation-- Gas <--RelatedTo--> American 
Outer <--RelatedTo--> Moon <--RelatedTo--> Face <--PartOf-- Eyebrow 