Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:All MLP analyses [also known as back-propagation artificial neural networks (ANNs)] were carried out with a user-friendly neural network simulation program, NeuFrame version 3.0.0.0 (Neural Computer Sciences, Lulworth Business Centre, Totton, Southampton, UK), which runs under Microsoft Windows NT on an IBMcompatible personal computer.
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