Assertion: trombone's slide | /r/CapableOf | move two positions
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Source sentences:
text: For example, a trill on B♭ 3 /C 4 is virtually impossible as the slide must move two positions (either 1st-to-3rd or 5th-to-3rd), however at an octave higher (B♭ 4 /C 5 ) the notes can both be achieved in 1st position as a lip trill.