The dorian is an easy mode to use in many ways. I believe I have pointed out before that it is symmetrical around the tonic (in this case D):
(half steps in bold)
G A B C D E F G A
Like the ionian (major) and phrygian, it is built from two similar tetrachords:
D E F G
A B C D
This feature is exploitable in the construction of a subject suitable to dorian and no other mode, as prescribed by Fux.
Here is the layout (tonic D, dominant A):
C D E F G A
G A B C D E
The subject can utilize a fifth above tonic and dominant and a whole step below.
(click on image to enlarge)
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