If you want to lure @Randal'Thor into answering our most recent Macbeth question, you need to point out it is Shakespeare's most mathematical play:
– "they / Doubly redoubled strokes upon the foe" (I.2);
– "se'nnights nine times nine" (I.3);
– "Thrice to thine and thrice to mine / And thrice again, to make up nine" (I.3);
etc.