Etudes Op. 10: No. 1 in C major / No. 2 in A minor

1 Etudes Op. 10: No. 1 in C major / No. 2 in A minor
2 Etudes Op. 10: No. 3 in E major / No. 4 in C-sharp minor
3 Etudes Op. 10: No. 7 in C major / No. 8 in F major
4 Etudes Op. 10: No. 9 in F minor / No. 10 in A-flat major
5 Etudes Op. 25: No. 1 in A-flat major / No. 2 in F minor
6 Etudes Op. 25: No. 7 in C-sharp minor / No. 8 in D-flat major
7 Etudes Op. 25: No. 9 in G-flat major / No. 10 in B minor