Question: matrix inside matrix

Hi,  if i have a matrix 4x4 as

A=[I          Y        -X        aX

     bY        Z         o          o

      X^T     O^T     0         0

       o^T  O^T       0         q ]   

where    I   indentity matrix 3X3 ,      X vector   3X1,         Y  matrix  3X3      Z matrix 3X3      O zero matrix 3X3  

and q constant

Is there a method in maple to do the matrix and find its inverse.

Amr

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