Because the higher notes of the 2nd octave easily break into a low note, these Doublings have to be executed in a different manner; For each of them there is also an alternative, with only 1 interjected gracenote:

g²-e²-g²-e² or e²-g²-e²; g²-f♯²-g²-f♯² or f♯²-g²-f♯²; a²-g²-a²-g² or g²-a²-g²; b²-a²-b²-a² or a²-b²-a²; c³-b²-c³-b² or b²-c³-b².
NB: Example(s) to be replaced with staff-notation.