Piece is a synonym of Patch. Patch is related to Clothing. 
Request is related to Beg. Beg is related to Homeless. you are likely to find Homeless in/at/on Bridge. Bridge is the opposite of Tunnel. 
Piece <--Synonym--> Patch <--RelatedTo--> Clothing 
Request <--RelatedTo--> Beg <--RelatedTo--> Homeless --AtLocation--> Bridge <--Antonym--> Tunnel 