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The matrix inversion lemma gives an explicit formula of the inverse of a positive definite matrix A added to a block of dyads (represented as BBH) as follows: (A+BBH)-1= A-1- A-1B(I + BHA-1B)-1BHA-1. It is well known in the literature that this formula is very useful to develop a block-based recursive least squares algorithm for the block-based recursive identification of linear systems or the design of adaptive filters. We extend this result to the case when the matrix A is singular and present a matrix pseudoinversion lemma along with some illustrative examples. Based on this result, we propose a block-based adaptive multichannel superexponential algorithm. We present simulation results for the performance of the block-based algorithm in order to show the usefulness of the matrix pseudoinversion lemma.