0     0     0     0     0     0     0     0
#&gt; [13,]     0     0     0     0     0     0     0     0     0     0     0     0
#&gt; [14,]     1     1     0     0     0     0     0     0     0     0     0     0
#&gt; [15,]     0     0     1     1     1     0     0     0     0     0     0     0
#&gt; [16,]     0     0     0     0     0     1     1     1     0     0     0     0
#&gt; [17,]     0     0     0     0     0     0     0     0     1     1     1     0
#&gt; [18,]     0     0     0     0     0     0 