Hereen or Herein: How To spell?

The word Hereen is misspelled against Herein, an adverb meaning "In this."

Word contains consecutive vowels 'EI' in between alphabets her & n is misspelled as 'EE'
Wrong Spelling:  her-ee-n 
Correct Spelling:  her-ei-n 
Explore spell check of Herein to spell without errors.