Step 1: Analyze the letter transformations from "PAPER" to "OZODQ". Assign numerical values (A=1, Z=26).
P(16) → O(15) : 16 - 1 = 15
A(1) → Z(26) : 1 - 1 = 0, which wraps to 26
P(16) → O(15) : 16 - 1 = 15
E(5) → D(4) : 5 - 1 = 4
R(18) → Q(17) : 18 - 1 = 17
Step 2: The pattern is a consistent backward shift of 1 letter alphabetically, with A looping back to Z.
Step 3: Apply this rule to "BOARD":
B(2) → A(1)
O(15) → N(14)
A(1) → Z(26) (wrap around)
R(18) → Q(17)
D(4) → C(3)
Step 4: Consequently, "BOARD" is encoded as "ANZQC".