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The short 
marks suggest emphasising the dissonant chord. The former, reaching slightly further into b. 2, could be even interpreted as a reversed long accent. According to us, just like in the case of other complementary indications, these marks may be used in the version of the main text too.
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category imprint: Differences between sources
issues: Scope of dynamic hairpins
notation: Articulation, Accents, Hairpins