clssification of a data series according to its numbers

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som
som 2013-4-13
Hi all,
I have some cells like "a" whose lenght decrease each step like below:
a{1}=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16]';
a{2}=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15]';
a{3}=[1 2 3 4 5 6 7 8 9 10 11 12 13 14]';
a{4}=[1 2 3 4 5 6 7 8 9 10 11 12 13]';
I wanto to classify the elements of a{1} , a{2}, a{3} and a{4} to "b", "c" , "d" and "e" cells, respectively. The dominant idea for classification is the elements of "b", "c" , "d" and "e" must be a ratio of 4 as possible. The desired outputes must be in the following way:
b{1}=a{1}(1:4,1); b{2}=a{1}(5:8,1); b{3}=a{1}(9:12,1); b{4}=a{1}(13:16,1);
c{1}=a{2}(1:4,1); c{2}=a{2}(5:8,1); c{3}=a{2}(9:12,1); c{4}=a{2}(13:15,1);
d{1}=a{3}(1:4,1); d{2}=a{3}(5:8,1); d{3}=a{3}(9:11,1); d{4}=a{3}(12:14,1);
e{1}=a{4}(1:4,1); e{2}=a{4}(5:7,1); e{3}=a{4}(8:10,1); e{4}=a{4}(11:13,1);
I have written a single program for a bove question but it's too complicated.
How can I write this program as short as possible? Thanks in advance.

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