The word Threteen is misspelled against Thretteen, an adjective meaning "Thirteen."
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Thretteen has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings thre & een which should not be misspelled with single 'T'
Wrong Spelling: thre-t-een
Correct Spelling: thre-tt-een
Explore spell check of Thretteen to spell without errors.