
Dear useRs,
I have a matrix in the following form

 [,1]   [,2]   [,3]   [,4]   [,5]   [,6]   [,7]   [,8]   [,9]  [,10]  [,11]      1      1       3      2       3       1      1       2      3       3      2

and following is my desired output  (combining the column headers, having same values).
a<-1,2,6,7

b<-3,5,9,10

c<-4,8,11
Thanks in advance
Elisa 		 	   		  
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