###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q56257721: Luby-Rackoff construction (Q56257721) : Model for the analysis of block ciphers : ( delete | history | links | entity usage | logs ) Reason: Duplicates already existing Q2995271 -- Ϛ ( talk ) 08:53, 27 August 2018 (UTC)