New in version 2.0.
Concatenate pitch_arrays:
abjad> from abjad.tools import pitcharraytools
abjad> array_1 = pitcharraytools.PitchArray([[1, 2, 1], [2, 1, 1]])
abjad> print array_1
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abjad> array_2 = pitcharraytools.PitchArray([[3, 4], [4, 3]])
abjad> print array_2
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abjad> array_3 = pitcharraytools.PitchArray([[1, 1], [1, 1]])
abjad> print array_3
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abjad> merged_array = pitcharraytools.concatenate_pitch_arrays([array_1, array_2, array_3])
abjad> print merged_array
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Return pitch array.