Each vowel in the word REFERTILIZES is changed to the second letter immediately following it in the English alphabetical order, and each consonant is changed to the second letter immediately preceding it in the English alphabetical order. Which of the following letters will appear exactly twice in the group of letters thus formed?
K
Apply the rule letter by letter to REFERTILIZES: vowels move +2 forward, consonants move −2 backward.
R(cons)→P, E(vow)→G, F(cons)→D, E(vow)→G, R(cons)→P, T(cons)→R, I(vow)→K, L(cons)→J, I(vow)→K, Z(cons)→X, E(vow)→G, S(cons)→Q.
The new group of letters is P, G, D, G, P, R, K, J, K, X, G, Q.
Counting occurrences: G appears three times, P appears twice, K appears twice, and each of D, R, J, X, Q appears once.
Among the given options, K appears exactly twice (R and X appear once, G appears thrice).
Hence, the letter appearing exactly twice is K.
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