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When ALTMULT_ACCUM is used to calculate ∑ (sum of sums of products and sums of squares) 1000 by 1000, please tell me how to control the start and end of the calculation for ∑.

When ALTMULT_ACCUM is used to calculate ∑ (sum of sums of products and sums of squares) 1000 by 1000, please tell me how to control the start and end of the calculation for ∑.