The word Tresel is misspelled against Tressel, a noun meaning "A trestle."
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Tressel has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings tre & el which should not be misspelled with single 'S'
Wrong Spelling:  tre-s-el 
Correct Spelling:  tre-ss-el 
Explore spell check of Tressel to spell without errors.