###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q21163046: ExoMars (Q21163046) : astrobiology project to investigate the past habitability environment of Mars : ( delete | history | links | entity usage | logs ) Empty (merged with Q672135 )
-- 84.227.98.15 21:30, 19 October 2016 (UTC)