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Frontiers missions be selected per decade, with the 2013-2022 period to contain the selection of New Frontiers 4 and 5. The 2011 Survey recommended that for New Frontiers 5, any candidate mission themes remaining from its list for New Frontiers 4 carry forward, and two further candidate themes be added, Io Observer and Lunar Geophysical Network. With the addition of the Ocean Worlds theme following the 2011 survey and the selection of Dragonfly as NF-4 in 2019, this left the list of eligible themes for NF-5 as:
* Comet Surface Sample Return

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