Determine AU (CUB) start by finding

C' and B' then find CUB

To determine AU (CUB), we first need to find C' and B', and then we can find CUB.

1. Finding C':
- Look for the given cube AU (CUB) and identify the A face. The center of the A face will be A'.
- In a cube, each face is connected to the center through edges. Find the edge connecting A' and A.
- The midpoint of this edge will give us C'. So, locate the midpoint of the edge connecting A' and A.

2. Finding B':
- Now, we need to find B' using a similar approach.
- Identify the B face in cube AU (CUB), and its center will be B'.
- Locate the edge connecting B' and B, and find the midpoint of this edge.

3. Finding CUB:
- Finally, we can determine CUB using the information we found earlier.
- In cube AU (CUB), the faces are labeled in a clockwise direction starting from the top face (A).
- So, we can figure out the position of CUB based on the position of C' and B'.
- Trace the edges connecting C' and B'. This edge will intersect with the C face at the position of CUB.
- Therefore, CUB is the center of the C face of cube AU (CUB), where C' and B' intersect.

By following these steps, we can determine AU (CUB) by finding C' and B', and then locating CUB based on their positions.