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The two notes we want to examine in the exercise are B (0 12) - for which the alternative is (0 23) - and E (x 123 45) - for which the alternative is (123 4 67).
The exercise calls for a series of Bs (each played alternately with the standard fingering and with the recommended alternative) and Es (each played alternately with the standard fingering and with the recommended alternative). By adjusting the breath pressure and tonal colour it should be possible to disguise or at least minimise any tonal changes that arise from a change of fingering.