If you want to spend 2 or 3 days on the project, use this:
Group 1 T A C C G A A C A A C A | Group 4 T A C T T T G T T C C A |
Group 2 T A C A C A C C A T A A | Group 5 T A C T A A A A A C G A |
Group 3 T A C C C A A C A A A A | Group 6 T A C C C C T A A T T T |
It is easier to complete this project in one block:
Group 1 A C A G C A | Group 4 G T T C C A |
Group 2 C C G T A A | Group 5 A A A C G C |
Group 3 A C A T A G | Group 6 G A A T C T |