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try e.g.
   mcl lattice.mci -o -
and
   mcx /lattice.mci lm tp add /- wm | mcl - -o -
(the mcx invocation transforms it to an undirected graph)

            11           
           /|\           
         9/ | \10        
          \ | /          
         __\|/_          
        /   8  \         
      6/    ____\7       
      /|\  /    /|\      
    2/ | \/   4/ | \5    
     \ | /3    \ | /     
      \|/       \|/      
      0         1        

(mclheader
mcltype matrix
dimensions 12x12
)
(mclmatrix
begin
0  2 3 6 $
1  4 5 7 $
2  6 $
3  6 7 $
4  7 $
5  7 $
6  8 $
7  8 $
8  5 10 11 $
9  11 $
10 11 $
11 $
)