Thretten or Thretteen: How To spell?

The word Thretten is misspelled against Thretteen, an adjective meaning "Thirteen."

Thretteen has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Thrett & n which should not be misspelled with single 'E'
Wrong Spelling:  Thrett-e-n 
Correct Spelling:  Thrett-ee-n 
Explore spell check of Thretteen to spell without errors.

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