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     1   | 
     1   | 
     2 import C1._  | 
     2 def urbanmain() = { | 
         | 
     3   import C1._  | 
     3   | 
     4   | 
     4 assert(collatz(1) == 0)   | 
     5   assert(collatz(1) == 0)   | 
     5 assert(collatz(6) == 8)  | 
     6   assert(collatz(6) == 8)  | 
     6 assert(collatz(9) == 19)  | 
     7   assert(collatz(9) == 19)  | 
     7   | 
     8   | 
         | 
     9 }  | 
     8   | 
    10   |