Yes, x1 and y1 are the same. Think of a grid:
<font face="Courier New, Courier, mono">
Y
|
v
X-> 1 2 3
1 . . .
2 . . .
3 . . .
</font>
Y coordinates going down, X going across.
That top left "." is 1,1. To use Y as a subfolder for X, you would need to start at 2 for the Y.
Eg.
1,1 = Name (N)
1,2 = Health (H)
1,3 = Speed (S)
This is what it would look like:
<font face="Courier New, Courier, mono">
1 N . .
2 H . .
3 S . .
</font>
Hope that helps.
<font size="2">(Edit: formatting)</font>