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Level 1, 2, and 3 BLAS

- Level 1 BLAS--vector-vector operations

*y y + x*, also dot product, ... - Level 2 BLAS--matrix-vector operations

*y y + Ax*, also triangular solve, rank-1 update - Level 3 BLAS--matrix-matrix operations

*A A + BC*, also block triangular solve, rank-k update

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