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            <funder>Acknowledgements The authors would like to thank the organizers of the Schubert Calculus conference at SYSU in 2017 for providing us an excellent environment for the discussions on the topic of this paper. This research was conducted in the framework of the research training group GRK 2240: Algebro-Geometric Methods in Algebra, Arithmetic and Topology, which is funded by the DFG. The second author is supported by JSPS Grant-in-Aid for Young Scientists (B) 16K17584.</funder>
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                <term xml:lang="en">Bott–Samelson resolution</term>
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