I. Run the first iteration of the neighbor joining algorithm for 
input distance matrix below. Show your values of ui, the matrix 
dij-(ui+uj), and the matrix after the first iteration as we did 
in class. Also write down the pair of nodes that will be selected
after the first iteration.

II. Write down the pair of nodes that are selected after the first
UPGMA iteration.

   0  1   2   3   4  
0     11  12  16  16
1         3   7   7 
2             6   6 
3                 2 
4                   

Submit hardcopy in class on Apr 22nd.