['This', 'is', 'because', 'the', 'complicated', 'effect', 'of', 'the', 'motion', 'of', 'the', 'surrounding', 'chains', 'on', 'the', 'dynamics', 'of', 'the', 'probe', 'chain', '–', 'called', '“', 'constraint', 'release', '”', '[', '69', ']', '–', 'is', 'absent', 'in', 'the', 'fixed', 'network', 'systems', '.']