The word Propylaia is misspelled against Propylaea, which is plural of "Propylaeum"
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Propylaea has vowels 'ae' together mispronounced as 'ai'
Word contains consecutive vowels 'AE' in between alphabets propyl & a is misspelled as 'AI'
Wrong Spelling:  propyl-ai-a 
Correct Spelling:  propyl-ae-a 
Find more incorrect spellings of Propylaea to spell right way.