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A352015
as
a triangular array
1
6
3
15
18
2
28
45
5
7
45
A352015
as
a square array
1
6
15
28
45
3
18
45
2
5
7
A352015
as
an upper right triangle
1
6
15
28
45
3
18
45
2
5
7
