Task: Pos Tagging
Input (English): Sentence: Thus , while it remains possible that the Babylonians and/or the Pythagoreans may perhaps have had the magic square of three before the Chinese did , more definite evidence will have to turn up from the Middle East or the Classical World {{ before }} China can lose her claim to the earliest known magic square by more than a thousand years . 
Word: before
Output (English): ADP