path mapping help....

I am working on some data grouping these days and come up with a problem that stops me...

I have 2 group of data that I need to merge with.

group 1:

{1;0} (N=61) - A

{1;1} (N=61) - B

{1;2} (N=61) - C

{2;0} (N=61) - D

{2;1} (N=60) - E

{2;2} (N=61) - F

group 2:

{0;0} (N=10) - U

{0;1} (N=10) - V

{0;2} (N=10) - W

{0;3} (N=10) - X

{0;4} (N=10) - Y

{0;5} (N=10) - Z

the idea case is I can merge those date sets in a pattern of A-U-B-V-C-W-D-X-E-Y-F-Z...so on

therefore I am thinking how could I modify the path on group 2 and make them becomes things like:

{0;0} (N=10) - U

{0;1} (N=10) - V

{0;2} (N=10) - W

{1;0} (N=10) - X

{1;1} (N=10) - Y

{1;2} (N=10) - Z

but I have no idea how could I modify the path in that way....

can anyone show me how to?