A piece from this collection opens with the right hand playing a tremolo between the notes D-flat and F while also playing the melodic line “D-flat, C, B-flat, A natural, B-flat.” Long arpeggiated chords in the second piece from this collection inspired its nickname “Rockets,” given to it by Ferruccio Busoni. The verse “He falls then rises a king” is evoked in the finale of a piece in this collection whose sections are separated by double octaves. (*) Tremolos evoke “snow-whirls” in the final piece in this collection. This collection, whose pieces include “Paysage” and “Wilde Jagd,” contains a piece that opens with leggiero thirty-second notes depicting the title “Feux follets.” Octaves accompanied by thirds give the impression of a galloping horse in a piece from this collection titled “Mazeppa.” For 10 points, name this set of 12 difficult etudes by Franz Liszt. ■END■ (10[1]0[1])