Which one of the following is the correct representation of the sequence of surface profiles if the channel slope changes from mild to steep ?

- 1
  
  $M_{1,} S_{1}$
- 2
  
  $M_{3} S_{2}$
- 3
  
  $M_{2} S_{3}$
- 4
  
  $M_{2} S_{2}$

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