The word Streitening is misspelled against Straitening, which is present continuous of "Straiten"
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Word contains consecutive vowels 'AI' in between alphabets str & tening is misspelled as 'EI'
Wrong Spelling:  str-ei-tening 
Correct Spelling:  str-ai-tening 
Find more wrongly spelled words of Straitening to spell it well.