1 2 20
2 3 15
3 4 3
4 5 17
5 6 28
6 1 23
1 7 1
2 7 4
3 7 9
4 7 16
5 7 25
6 7 36
##</code><code>##

my @item_array = {{1, 2, 20}, {2, 3, 15}, {3,4,3}, {4, 5, 17}, {5,6,28}, {6,1,23}, {1, 7, 1}, {2, 7, 4}, {3, 7, 9,}, {4, 7, 16}, {5, 7, 25}, {6, 7, 36}};