The floowing are the sewage treatment process:

1. primary sedimentation

2. screening

3. grit removal

4. secondary sedimentation

When only preliminary treatment is to be given for sewage, select the required treatment processes including their correct sequence from the codes given below.

Codes:

- 1
  
  2, 3
- 2
  
  2, 3, 1
- 3
  
  1, 2, 3, 4
- 4
  
  3, 1, 2, 4

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