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when did Woah become an acceptable spelling of Whoa? books.google.com/ngrams/graph?content=whoa%2C+woah&case_insensitive=on&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t4%3B%2Cwhoa%3B%2Cc0%3B%2Cs0%3B%3BWhoa%3B%2Cc0%3B%3Bwhoa%3B%2Cc0%3B%3BWHOA%3B%2Cc0%3B.t4%3B%2Cwoah%3B%2Cc0%3B%2Cs0%3B%3BWoah%3B%2Cc0%3B%3Bwoah%3B%2Cc0%3B%3BwoaH%3B%2Cc0%3B%3BWOAH%3B%2Cc0