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Thanks for replies ---Yes the O is part of the clue -- it looks like Memory Loss I don't have any more letters right now as I was hoping to solve 10 across which has clue Check the time before it's presented (2 Words Of 3 & 5 Letters) ??? D?T?D And 20 Across Any reason why fire-fighters should fear it (4 Letters) ???L I think that's HELL