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13.	Complete the last row of the puzzle?

Answer

There are two chains of letters in use. The first goes diagonally upwards from left to right starting in the top left corner and appears on alternate lines. This chain contains every letter of the alphabet except vowels. The second chain starts bottom right and goes diagonally downwards from right to left and contains every letter of the alphabet.

14.	Which letter replaces the blank and completes the puzzle?

Answer

Ans = X. Working left to right, starting on the top row, letters increase in value in steps of 2, 3 and 4.