∵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.