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We present an algorithm to combine multiple matrix elements at LO and NLOwith a parton shower. We build on the unitarized merging paradigm. Theinclusion of higher orders and multiplicities reduce the scale uncertaintiesfor observables sensitive to hard emissions, while preserving the features ofinclusive quantities. The combination allows further soft and collinearemissions to be predicted by the all-order parton shower approximation. Weinspect the impact of terms that are formally but not parametricallynegligible. We present results for a number of collider observables wheremultiple jets are observed, either on their own or in the presence ofadditional uncoloured particles. The algorithm is implemented in the eventgenerator Herwig.

Merging NLO Multi-jet Calculations with Improved Unitarization