Section 4.2 Lexical syntax (page 12) defines what "constituents" are  
by enumerating their unicode categories.  The inclusion of the  
category "Co" is interesting since it's a unicode "private use"  
category containing only the following markers:

E000;<Private Use, First>;Co;0;L;;;;;N;;;;;
F8FF;<Private Use, Last>;Co;0;L;;;;;N;;;;;
F0000;<Plane 15 Private Use, First>;Co;0;L;;;;;N;;;;;
FFFFD;<Plane 15 Private Use, Last>;Co;0;L;;;;;N;;;;;
100000;<Plane 16 Private Use, First>;Co;0;L;;;;;N;;;;;
10FFFD;<Plane 16 Private Use, Last>;Co;0;L;;;;;N;;;;;

Is that "Co" a typo for something else?  Or should it just be removed?

Aziz,,,

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