Since the material in section 3 is not exactly the same, we will call it A’.
And we decided that the middle section was not the same material as section 1 and 3.
Therefore, it is called B.
So we have this as our diagram so far.
Since the material in section 3 is not exactly the same, we will call it A’.
And we decided that the middle section was not the same material as section 1 and 3.
Therefore, it is called B.
So we have this as our diagram so far.