∵E is the midpoint of BC, ABCD is the square, and O is the diagonal intersection.
∴OE//AB 2OE=AB
Cubic ABCD-A'B'C'D
∴NB' sum of parallel lines =OE
∴ is a parallelogram
∴ON parallel electron beam'
So in parallel planes,
M and n are the midpoint of A'D' and A'B' respectively.
MN parallel B'D'
MN is parallel to the plane b'd 'e.
Manganese crosses on nitrogen
Manganese and indium belong to surface MNO
So MNO's plane took off.