Column Extraction from matrix

Hi all,

I have a 4 by 100 matrix. I wish to extract each column and make it into a 2
by 2 matrix. 
I also want to assign names for each 2X2 matrix. 
For example

set.seed(2)
 a=matrix(rnorm(400),ncol=100)
a1=matrix(a[,1],ncol=2)
a2=matrix(a[,2],ncol=2)
.
.
.
a100=matrix(a[,100],ncol=2)   

Any simple ideas. Thanks.

B




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