###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q1758560: air brake (Q1758560) : flight control surface used on an aircraft to increase drag : ( delete | history | links | entity usage | logs ) Merged into Q1004684 . -- Polyglot ( talk ) 11:23, 22 May 2014 (UTC)