Question: How to combine 4 matrices in one ?

a1 := Matrix(3, [1, 2, 3, 7, 8, 9, 13, 14, 15]);
a2 := Matrix(3, 2, [5, 6, 11, 12, 17, 18]);
a3 := Matrix(2, [19, 20, 25, 26]);
a2 := Matrix(3, 2, [5, 6, 11, 12, 17, 18]);



i want to combine above matrices in big matrix like

A := Matrix(2, 2, [a1, a2, a3, a4]);

best regards

 

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