Analysis of the C Major Invention (BWV 772) by Bach

Measures 11 and 12

The sequence of measures 3 and 4 is now repeated with the following changes:

1. Invertible counterpoint (like in measures 7 and 8).
2. We are now in the D Minor key. Measures 3 and 4 took us from the C Major key to G Major (ascending 5th), now this sequence will take us from D Minor to A Minor (ascending 5th also):

Subject by inversion in yellow, by augmentation in blue

Compare with measures 7 and 8: