5. A system according to claim 3 , further comprising: a rotation module to rotate the unplaced spine group around the center ring when the unplaced spine group and the most similar placed unique spine overlap.
5. A system according to claim 3 , further comprising: a rotation module to rotate the unplaced spine group around the center ring when the unplaced spine group and the most similar placed unique spine overlap. 6. A system according to claim 5 , wherein the unplaced spine group is rotated in a direction comprising at least one of a clockwise and a counter-clockwise direction.