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The ThOr::Combiner is considerably more complex as it must juggle various sets of indices in order to support SIMD-based vectorisation. The NBodyParticleCombiner operates on legacy LHCb::Particle objects for which SIMD support is not foreseen. This allows a simpler NBodyParticleCombiner implementation while keeping the concepts in ThOr::Combiner. A brave code spelunker can read either combiner to understand the mechanics of the combinatorics loop and vertex fitting. Moved from Phys@6935a8e4
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