Greetings R folks, 

I am stuck on a problem that I suspect can be solved somewhat easily. 

I have social network data stored in dyads as below, where the numbers 
representing ego and alter are identifiers, so that number 1 as an ego is the 
same person as number 1 as an alter etc. 


      ego alter
1      1     2
2      1     3
3      2     1
4      2     4
5      3     1
6      3     2
7      3     4
8      3     6
9      4     1
10   5     3
11    5     6
12    6     4

What I would like to do is to create new dyads which match up the ego with the 
alter's alters as below (preferably removing dyads in which ego and alter2 are 
the same):

     ego alter2
1      1     4
2      1     2
3      1     4
4      1     6
5      2     3
6      2     1
7      3     2
8      3     1
9      3     4
10    3     1
11    3     4
12    4     2
13    4     3
14    5     1
15    5     2
16    5     4
17    5     6
18    5     4
19    6     1


Any suggestions as to how to do this would be greatly appreciated. 

Holly
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