Words Puzzles

13. Fill in the empty box with the correct letter ?
In columns : the central number equals the sum of the numerical value of the top and bottom letters.
14. Which letter should go in the empty circle?
Starling at the top left of the first figure and moving in a Z shape, letter values increase by 2, then 3, then 4, 5, and 6 to reach the top figure in the next diagram.
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