15. A method according to claim 11 , wherein the unplaced spine is positioned in relation to one of the placed unique spines, comprising: identifying an anchor cluster on the placed unique spine; and placing the unplaced spine along a vector defined from a center of the anchor cluster.
15. A method according to claim 11 , wherein the unplaced spine is positioned in relation to one of the placed unique spines, comprising: identifying an anchor cluster on the placed unique spine; and placing the unplaced spine along a vector defined from a center of the anchor cluster. 16. A method according to claim 15 , wherein the anchor cluster comprises at least one concept in common with the unplaced spine.