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We use ISAJET to perform a detailed study of the multilepton signals expectedfrom cascade decays of supersymmetric particle produced at the CERN LHC. Ouranalysis is performed within the framework of the minimal supergravity modelwith gauge coupling unification and radiative electroweak symmetry breaking. Wedelineate the regions of parameter space where jets plus missing energy plus 1,2 (opposite sign and same-sign dileptons), and 3 isolated lepton events shouldbe visible above standard model backgrounds. We find that if any $\eslt$ signalat the LHC is to be attributed to gluino and/or squark production, and if$m_{\tg} \alt 1$~TeV, then several of these signals must be simultaneouslyobservable. Furthermore, assuming $10\,\fb^{-1}$ of integrated luminosity, wefind that the reach for supersymmetry in the 1$\ell + \jets +\eslt$ channelextends to $m_{\tg}\sim 2300\ (1600)$ GeV for $m_{\tq}\sim m_{\tg}$ ($m_{\tq}\sim 1.5m_{\tg}$), and exceeds the corresponding reach in the $0\ell+\eslt$channel. We show that measurements of the various topological cross sections,jet and $B$-hadron multiplicities in these events, together with the chargeasymmetry for single lepton and same-sign dilepton events, and flavor asymmetryfor opposite sign dilepton events, serve to narrow the allowed range ofunderlying SUGRA parameter values. We also delineate parameter regions wheresignals with clean isolated dilepton (from slepton production) and trileptonevents (from chargino/neutralino production) are visible at the LHC, andexamine the extent to which these signals can be separated from other SUSYsources.Comment: 35 page REVTEX file; 18 uuencoded EPS figures are included. Full  resolution ones available via anonymous ftp at  ftp://hep.fsu.edu/preprints/baer/xxx.uu; a complete PS file of text and  figures is also available as FSUHEP951215.p

Signals for minimal supergravity at the CERN Large Hadron Collider. II. Multilepton channels