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Table 1 The signals used in each presentation can be separated into three groups with different interval sizes, each consisting of 6 tone pairs with two references D and G# in octaves 3, 4, and 5.

From: Pitch Ranking, Melody Contour and Instrument Recognition Tests Using Two Semitone Frequency Maps for Nucleus Cochlear Implants

Groups
Semitone intervals 1 D3, D3# D4, D4# D5, D5# G3#, A3 G4#, A4 G5#, A5
  3 D3, F3 D4, F4 D5, F5 G3#, B3 G4#, B4 G5#, B5
  6 D3, G3# D4, G4# D5, G5# G3#, D4 G4#, D5 G5#, D6