Editing OOB's

[KEYSTONE07950]

Forgive me if this has been explained in the manuals.  I cannot find the explanation.

I have taken the following line from an OOB file:

U 233 4 C C 48 212 1/2nd Penn Cav

I would imagine the "U" means unit.
The "233" is the number of men in the unit.
What does the "4" represent???
The "C C" probably means cavalry carbine.
What does the "48" and "212" represent?

Thank you.  I'm sure I will have additional questions going forward.