Help in Annihilator

[Skylinx]

 -- starting = Upper left point of the annihilator room area.
 -- ending = Bottom right point of the annihilator room area.

-- Here is the code start:
starting={x=33219, y=31657, z=13, stackpos=253}
checking={x=starting.x, y=starting.y, z=starting.z, stackpos=starting.stackpos}
ending={x=33225, y=31662, z=13, stackpos=253}

Does anyone know what the fuck they mean by, UPPER LEFT POINT and BOTTOM RIGHT POINT.
Theres like 3 diff rooms, which one are they talking about -____-
Like wtff
help =\

 

[Don Daniello]

Look, one cross is one square:
+ + + +
+ + + +
+ + + +

Red is top left and blue is bottom right.

 

[Skylinx]

Ok thanks.

 

[Don Daniello]

rep ?