Steve's Spinal Column #16

The Full Sticktet

The Major scale has but one mathematical formula. Eight notes ascending thus:

        X    _    _     _    _    _    _      X
steps       1   1   1/2   1    1    1    1/2
 
          C    D    E    F    G    A    B    C
          1    2    3    4    5    6    7    8
 
But the minor counterpart has quite a few variations:
 
In relation to the parallel Major (use C as above):
 
C pure (natural) minor = C  D  Eb F  G  Ab  Bb C (relative of Eb Major)
                         1  2  b3 4  5  b6  b7 8
 
C harmonic minor = C  D  Eb  F  G  Ab  B  C (raise the 7)
                   1  2  b3  4  5  b6  7  8
 
C melodic minor = C  D  Eb  F G  A  B  C (raise the 6 and 7)
                  1  2  b3  4 5  6  7  8
 
C dorian mode = C  D  Eb  F G  A  Bb  C (same as Bb Major)
                1  2  b3  4 5  6  b7  8
 
C phrygian mode = C Db Eb F G  Ab Bb C (same as Ab Major)
                  1 b2 b3 4 5  b6 b7 8
 
C aeolian mode= C  D Eb  F G  Ab Bb C (same as pure minor)
                1  2 b3  4 5  b6 b7 8
 
C blues scale= C Eb  F Gb G Bb C (without Gb this is called pentatonic)
               1 b3  4 b5 5 b7 8
 
If we summarize, it's possible to play 11 notes in Cminor.
Composite of the above scales:
 
C Db D Eb F Gb G Ab A Bb B
 
Out of a chromatic scale (every note) only one tone is missing,
What is it and why?

First one to answer correctly (send to me directly) wins a lesson with Jim Reilly.
(a hockey lesson of course)