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Regarding the question mark, it is outside the shape and seems to form the end of the "Is Abe dead?" Section
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I think you might have the answer there - the ?????? was a distraction! The true answer to the whole Witness puzzle section was within the shape and was solely ABEFACE1, so I suppose we just had to get the MP4 part. and the "15/IS ABE DEAD ??????" was probably meant to make us realise that the "?" wasn't related to ABEFACE1, and was it's own phrase.