5 RemoveEmptyStaves should keep the pre-existing value of
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6 @code{auto-knee-gap}. In this case, the cross-staff beam
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7 should be between the two staves.
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11 staffMusic = \new StaffGroup {
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18 \change Staff = "lh"
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20 \change Staff = "rh"
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44 \override Beam #'auto-knee-gap = #4.5
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