Rank of matrix $M$

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Let $M$ a matrix over $M(m,k,\mathbb{K})$ and matrix $B$ over $M(m,l,\mathbb{K})$. What is the sufficient condition for $\operatorname{rank}(\lbrack M\mid B \rbrack ) = \operatorname{rank}(M)$?

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(Assuming I've understood your notation correctly)

You need each column of $B$ to be a linear combination of columns of $M$.