I've only heard it said as follows.
[#19560] Misfortunes never come singly. (Nero)
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http://googlefight.com/index.ph...ome+singly.%22
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This sentence was initially added as a translation of sentence #2457785
added by Guybrush88, May 26, 2013
linked by Guybrush88, May 26, 2013
linked by Alois, May 30, 2013
linked by Kalle63, March 5, 2014
linked by deyta, August 31, 2016