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We study NSR strings in the Nappi-Witten background, which is the Penroselimit of a certain NS5-brane supergravity solution. We solve the theory in thelight-cone gauge, obtaining the spectrum, which is space-time supersymmetric.In light of the LST/NS5-brane duality, this spectrum should be incorrespondence with the states of little string theory in the appropriatelimit. A semiclassical analysis verifies that the relationship between energyand angular momentum, after a field redefinition, matches the known result fora flat background.Comment: 13 pages, revtex. v2: Typos mended; explanation clarified; reference  adde

Neveu-Schwarz 5-brane and little string duality in thepp-wave limit