For different layers of cement concrete floor. Pick up the incorrect statement from the following is

- 1
  
  The lowest layer consists of consolidated ground
- 2
  
  A 10 cm thick clean sand is laid on consolidated ground
- 3
  
  A 10 cm lime concrete (1 : 4 : 8) is laid on clean sand
- 4
  
  A 10 cm thick cement concrete (1 : 2 : 4) is laid on top layer

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