Working group: Multi-Jet final states and energy flows - Gwenlan, C; Lönnblad, L; Rodrigues, E; Zanderighi, G; Bacchetta, A; Banfi, A; Baranov, S; Bartels, J; Bunyatyan, A; Bunyatyan, A; Coco, V; Corcella, G; et al. (Proceedings of the Workshop - HERA and the LHC: Workshop Series on the Implications of HERA for LHC Physics, HERA-LHC 2006 - 2008, 2009)