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Triangles with pranksters

Instructions:

Insert numbers into empty fields in triangle (grape). The sum of two neighbouring numbers in one row must be equal to number below those fields. You may use only "pranskters" - numbers, which are known and located below triangle (grape).

Example

1
0
6
1
  
6
  
7
  
20
  
21
  
22
  
29
  

Solution

20
1
0
6
21
1
6
22
7
29

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