SLP is a software for single-linkage preclustering for improved OTU clustering . It was based on pairwise distances this is used as a preliminary step before average linkage clustering of short (<250nt) sequences.
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Huse, SM, Mark Welch, D, Morrison, HG, and Sogin, ML (2010)
Ironing out the wrinkles in the rare biosphere through improved OTU clustering.
Environmental Microbiology (2010) 12(7), 1889-1898.