In a certain code language, 'SEQUINS' is written as 'HVJFKPU' and 'REACTED' is written as 'IVZXVGF'. How will 'PROCESS' be written as in that language?

Let's find the pattern for SEQUINS $\to$ HVJFKPU:Opposite letter of S is HOpposite letter of E is VOpposite letter of Q is JOpposite letter of U is FOpposite letter of I is R $\to$ code says K? Wait, let's look closer at pairs.Let's write down positions of SEQUINS and HVJFKPU:S(19) $\to$ H(8) [Opposite]E(5) $\to$ V(22) [Opposite]Q(17) $\to$ J(10) [Opposite]U(21) $\to$ F(6) [Opposite]I(9) $\to$ K(11) [Wait, $9+2=11$?]N(14) $\to$ P(16) [$14+2=16$?]S(19) $\to$ U(21) [$19+2=21$?]Let's re-verify with REACTED $\to$ IVZXVGF:R(18) $\to$ I(9) [Opposite]E(5) $\to$ V(22) [Opposite]A(1) $\to$ Z(26) [Opposite]C(3) $\to$ X(24) [Opposite]T(20) $\to$ V(22) [$20+2=22$ ]E(5) $\to$ G(7) [$5+2=7$ ]D(4) $\to$ F(6) [$4+2=6$ ]So the pattern is:First 4 letters: Replaced by their opposite pairs.Remaining letters: $+2$ positional shift.Let's apply this to PROCESS (7 letters):First 4 letters (P, R, O, C) $\to$ Opposite pairs:P $\to$ KR $\to$ IO $\to$ LC $\to$ XLast 3 letters (E, S, S) $\to$ Add $+2$:E(5) $+2=7\to$ GS(19) $+2=21\to$ US(19) $+2=21\to$ UCombining them together: KILXGUU.