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Accessing the "Echelon basis matrix" of kernel of a Matrix

For any matrix A when we type


It returns

Free module of degree 45 and rank 12 over Integer Ring
Echelon basis matrix:`[ 1  0 -1][ 0  1  2][ 0  0  0]`

How to I access this Echelon basis matrix directly?

I have tried this


but it says

TypeError: echelon_form() takes at least 2 arguments (1 given)