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/usr/lib/R/site-library/slam/INDEX is in r-cran-slam 0.1-32-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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abind_simple_sparse_array
                        Combine Sparse Arrays
read_stm_CLUTO          Read and Write Sparse Matrix Format Files
rollup                  Rollup Sparse Arrays
row_norms               Row and Column Norms
row_sums                Form Row and Column Sums and Means
rowapply_simple_triplet_matrix
                        Apply Functions Over Sparse Matrix Margins
simple_sparse_array     Simple Sparse Arrays
simple_triplet_matrix   Simple Triplet Matrix
tcrossprod_simple_triplet_matrix
                        Matrix Crossproduct