The word Retos is misspelled against Retoss, a verb meaning "To toss back or again."
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Retoss has double 'ss' in the end mispronounced as 's'
Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  reto-s 
Correct Spelling:  reto-ss 
Find more incorrect spellings of Retoss to spell right way.