There is only 1 possibility here, from A Minor to D Minor.

It was current practice, in the first half of theXVIIIth century,
to modulate from the Key of A Minor [I] to the Key of E Minor [V],
a practice which soon disappeared,
because the chord [V] is really E major, not E minor,
andmodulating to the Key of D Minor[IV] is far preferable.

A Minor To D Minor

The D Minor Circle has also maintained its original harmonic binary form,
          with the major cadence (C⁷ - F⁺⁷ , chords 3 and 4) also attenuated.
     In order to reach the Key signature of 1 flat, chords 1 and 2 areDominantized(D⁷ andG⁷ ).

Conclusion

Strength Of Modulations
With the possible exception of A Minor to its DOMINANT E Major,
     these Exterior Modulations are sufficiently strong to project
               a sensation of Antecedent-Consequent,
          in which the second circle always dominates the first,
               even when the same two circles are inverted,
                    as inC Major to A MinorandA Minor to C Major.

To theModuCode

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