A Language That Only Has the Letters D, F, J, and K. So How Does This Work? It Has to Do With the Order of the Alphabet. D is the 4th Letter. F is the 6th Letter. B is the 2nd Letter. So, F - D = B. K is the 11th Letter. J is the 10th Letter. A is the 1st Letter. So, K - J = A.
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