list of strings-newline

[kavitha thankaian]

Hi
   
  i have a list as follows
   
  list="a1,b1,c1,d1,a2,b2,c2,d2,a3,b3,c3,d3,
   
  I would like to print as 
   
  a1,b1,c1,d1,
  a2,b2,c2,d2,
  a3,b3,c3,d3,
   
  and then i would like to delete the  comma at the end,,say like,,
   
  a1,b1,c1,d1
  a2,b2,c2,d2
  a3,b3,c3,d3
   
  (its always after the length is 4 i would like to write as the next line)
  if any one has any suggestions pls write to me,,
   
   
   

                                
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