In contrapunctus 14, 3 themes are used. The first theme is also used in inverse.
In figure 13 the three themes, not transponed, are displayed. These are bar 7 to 13 form page 5 of the autograph, without the soprano.
In figure 14 the themes are displayed in graphic (with the soprano of bar 7-13 of page 5) . The first theme is the bas, the tenor is third theme and the alt is the second theme. Blacklines are octave intervals, green lines are major thirds. The third theme is the harmonizing theme.
The notes of the third theme constitutes the name BACH (Bes-A-C-B).