m1 = ConstantArray[0, {2, 2}];
    For[i = 1; ii = 1, i <= 3, i += 2; ii += 1,
      For[j = 1; jj = 1, j <= 3, j += 2; jj += 1,
       m1[[ii, jj]] = [CurlyCapitalUpsilon][[i, j]]]];
    m1 // MatrixForm
    m2 = ConstantArray[0, {2, 2}];
    For[i = 1; ii = 1, i <= 3, i += 2; ii += 1,
      For[j = 9; jj = 1, j <= 11, j += 2; jj += 1,
       m2[[ii, jj]] = [CurlyCapitalUpsilon][[i, j]]]];
    m2 // MatrixForm
    m3 = ConstantArray[0, {2, 2}];
    For[i = 9; ii = 1, i <= 11, i += 2; ii += 1,
      For[j = 1; jj = 1, j <= 3, j += 2; jj += 1,
       m3[[ii, jj]] = [CurlyCapitalUpsilon][[i, j]]]];
    m3 // MatrixForm
    m4 = ConstantArray[0, {2, 2}];
    For[i = 9; ii = 1, i <= 11, i += 2; ii += 1,
      For[j = 9; jj = 1, j <= 11, j += 2; jj += 1,
       m4[[ii, jj]] = [CurlyCapitalUpsilon][[i, j]]]];
    m4 // MatrixForm
    ArrayFlatten[{{m1, m2}, {m3, m4}}] // MatrixForm
{{1 + 2 [Mu], 0, 0, 0}, {0, 1 + 2 [Mu], 0, 0}, {0, 0, 1 + 2 [Mu],
  0}, {0, 0, 0, 1 + 2 [Mu]}}