anchor.diff:  (**
   ### Tuples
   
  -Tuples support are limited. Single tuple trunsfer to GPU is supported, but metods Array.ToHOst and Array.ToGPU is not.
  +Tuples support are limited. Single tuple trunsfer to GPU is supported, but methods Array.ToHost and Array.ToGPU is not.
   Also you can use tuples in kernel code.
   *)
   
  
positive.code: (**
  ##Control flow
  
  ### Sequential opertions
  *)
  
  let command = 
  
negative.code: 
  (**
  [More examples.]()
  *)
  