Before revision:  In this and in a companion paper (see arXiv:1103.1249 physics.soc-ph ) , we employ a recently-proposed randomization method to assess in detail the role that local properties have in shaping higher-order patterns of the ITN in all its possible representations (binary/weighted, directed/undirected, aggregated/disaggregated  ) and across several years.
After revision:  In this and in a companion paper (see arXiv:1103.1249 physics.soc-ph ) , we employ a recently proposed randomization method to assess in detail the role that local properties have in shaping higher-order patterns of the ITN in all its possible representations (binary/weighted, directed/undirected, aggregated/disaggregated ) and across several years.