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It is unclear how many couplings can be removed before it stops behaving like a black hole.","posed_since":"2020","precise":"In sparse Majorana SYK with $N$ fermions and k N four-body terms chosen at random, find the critical $k_c$ (as $N\\to\\infty$) below which the low-temperature Schwarzian regime and near-maximal Lyapunov exponent are lost, and the $1/k$ corrections above it. 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