Creating adjacency list from a given text file

So id like to create a function that would convert a table of numbers that is 2 columns by N rows, and output an adjacency table so take the following:
1 2
1 5
2 3
2 5
3 4
4 5
4 6
and output
2 5
1 3 5
2 4
3 5 6
1 2 4
4
where each row is a vector containing the numbers adjacent from the input (i.e 1 2; 1 5 becomes 2 5 on the first row)

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