- def handle(switch) 
-   case switch 
-   when 'a', 
-     print(switch << 'a') 
-   when 'n', 
-     print(switch.sub!('b','n')) 
-   when 'q', 
-     print(switch.gsub('b','q')) 
-   when 'b', 
-     nil 
-   else 
-     print('s!') 
-   end 
- end 
-   
- handle('b') 
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