search numbers in 2 cols

Hi All:

I'm just starting to use VB and I have a little problem in which I need as much help as possible:

I have a path of number

1 2 3 4 5
..........6 7
This path of number can be write in two columns of numbers:
1 2
4 5
2 3
3 6
7 6
3 4
I want to write a program that will start out to search for number 1 in col 1, if it is found in col1 then it next number is in col2, if it is found in col2 then its next number is in col1. I want the program to map it out so it will look like this:
1 2 3 4 5
1 2 3 6 7

Notice the number start to split at 3 to 3 4 and 3 6. My program right now just pick the first path and finish it without coming back to the second path, I need help with a code so that it can come back for the second path.

I will be very thankful if someone can help me with this.

Sincerely,

VBisgreat

sorry, I couldn't draw the path into a ---< shape
1 2 3 4 5
..........6 7