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The first search for the rare kaon decay $\kppnn$ has been performed by theE391a collaboration at the KEK 12-GeV proton synchrotron. An upper limit of$4.7\times10^{-5}$ at the 90 % confidence level was set for the branching ratioof the decay $\kppnn$ using about 10 % of the data collected during the firstperiod of data taking. First limits for the decay mode $\kppP$, where $P$ is apseudoscalar particle, were also set.Comment: 5 pages, 4 figures, published in PRD, corrected gramma

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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