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| KASH3 Reference Manual
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| ### Function ExtractBlock ( elt-alg^mat/res^pow M, elt-ord^rat i, elt-ord^rat j, elt-ord^rat p, elt-ord^rat q ) -> elt-alg^mat/res^pow O ### Description Return the p by q submatrix of M whose first entry is the [i, j]-th entry of M.
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