______
12
__________
17
______________ __ ____________
  2
________ ____ ______
 20 
____________ ________________
921 
____________ __ ________________
14  7
________ ______________ ____ ________
 19 6 
____________ __ ______
  15
__________ ______
3 
____________
11
__________________
416
__________ ____________
85 
__________ __________________ __
 18 10
________ ________________
1 13