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This paper reports an overview of experimental results and theoretical predictions about the annihilation at rest on nuclei. It stresses that the annihilation on 4He creates an environment very favourable to the formation of strange quarks and describes results of recent analyses on this process made on data collected with the spectrometer Obelix at the LEAR accelerator of CERN. The results concern the high strangeness production in specific reaction channels, double-strangeness production and signals for the production of the pentaquark Θ+(1539) and antikaon-few-nucleon bound states like K− pn,K− pnn and K−d.
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