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August 11, 2010Grund 4: Arbeit kostet ZeitPlayArbeit (W) = Leistung (P) x Zeit (t)...moreShareView all episodesBy Dominik Sichling und Roland GriemAugust 11, 2010Grund 4: Arbeit kostet ZeitPlayArbeit (W) = Leistung (P) x Zeit (t)...more