The integers 2 through 9 are each placed in the figure with one integer in each of the eight smallest triangles. The integers are placed so that the pairs of integers in each of the four smallest squares have the same sum. What is that sum?

[asy]
size(101);
draw(unitsquare);
draw(shift(up)*shift(right)*unitsquare);
filldraw(shift(up)*unitsquare,gray(.6));
filldraw(shift(right)*unitsquare,gray(.6));
draw((0,0)--(2,2)^^(0,2)--(2,0));
[/asy]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The integers 2 through 9 are each placed in the figure with one integer in each of the eight smallest triangles. The integers are placed so that the pairs of integers in each of the four smallest squares have the same sum. What is that sum?

[asy]
size(101);
draw(unitsquare);
draw(shift(up)*shift(right)*unitsquare);
filldraw(shift(up)*unitsquare,gray(.6));
filldraw(shift(right)*unitsquare,gray(.6));
draw((0,0)--(2,2)^^(0,2)--(2,0));
[/asy]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
11
The integers 2 through 9 are each placed in the figure with one integer in each of the eight smallest triangles. The integers are placed so that the pairs of integers in each of the four smallest squares have the same sum. What is that sum?

[asy]
size(101);
draw(unitsquare);
draw(shift(up)*shift(right)*unitsquare);
filldraw(shift(up)*unitsquare,gray(.6));
filldraw(shift(right)*unitsquare,gray(.6));
draw((0,0)--(2,2)^^(0,2)--(2,0));
[/asy]
train