Ie, using the letters 'c' for IC and 'o' for OOC, as Seebs allocated them, you could choose
1) 'c' meaning always IC
2) 'o' meaning currently OOC
3) '' (ie neither) meaning currently (but not necessarily always) IC
Otherwise, what is the point in having two separate flags? You could just have one that was either present or not.
And so, if that was the intended purpose of the "IC" flag, then we thought it could use a better description of itself as such.