8. A method according to claim 7, comprising the steps of: a. recognizing multiple intersections of a chain from map A and a chain from map B; b. detecting a mutual orientation of potentially matchable chains; and c. rejecting potential 0-cell matches which do not agree with the orientation.
7. A method according to claim 1 wherein said matching step b comprises the step of: building an isomorphism between two subsets of 0-cells by several successive runs of different filtering procedures which reject certain potential matches if they are recognized as invalid.