Reconstruction from Subsequences,
M. Dudik and Leonard J. Schulman. J. Combinatorial Theory Series A, to
appear.
We consider the problem of reconstructing an $n$-sequence, given
the multiplicities with which $k$-sequences occur as subsequences. We
improve the lower bound on $k$ from $\Omega(\log n)$ to
$\exp(\Omega(\log^{1/2} n))$.