Flowchart of the removal of random clusters. At beginning we have the ordered set {C_i} obtained with the iSRS clustering. The initial list of survived clusters contains only the special cluster C_whole. At step j, cluster C_j of the ordered set {C_i} is evaluated: its parent is identified within the current list (if no parent cluster exists, C_whole is used as parent). If the cluster C_j is among the statistically relevant clusters with respect to its parent, it is added to . When all thecluster of the initial set {C_i} are evaluated, the procedure stops and is built.