 1             1             1 
 1             1             2 
 1             1             3 
 1             1             4 
 1             1             5 
 1             2             1 
 1             2             2 
 1             2             3 
 1             2             4 
 1             2             5 
 1             3             1 
 1             3             2 
 1             3             3 
 1             3             4 
 1             3             5 
outer
 2             1             1 
 2             1             2 
 2             1             3 
 2             1             4 
 2             1             5 
 2             2             1 
 2             2             2 
 2             2             3 
 2             2             4 
 2             2             5 
 2             3             1 
 2             3             2 
 2             3             3 
 2             3             4 
 2             3             5 
outer
