Assistance is a synonym of Lift. Lift is a synonym of Air. you are likely to find Plain in/at/on Air. Plain is related to Rice. 
Silk is related to Very. Very is related to Dark. Dark is related to Space. you are likely to find Space in/at/on Universe. 
Assistance <--Synonym--> Lift <--Synonym--> Air <--AtLocation-- Plain <--RelatedTo--> Rice 
Silk <--RelatedTo--> Very <--RelatedTo--> Dark <--RelatedTo--> Space --AtLocation--> Universe 