In a certain code, COMPATIBLE is written as BQNPDDKAHS. How is STABILISED written in that code ?

The word COMPATIBLE is divided into two parts of equal lengths : COMPA & TIBLE

I : COMPA - BQNPD

The diagonally opposite element is substituted by its immediate following alphabet in the English alphabetical series.

=> C is substituted by D at its diagonally opposite position. Similarly, O is substituted by P at its diagonally opposite position and similarly for M, P and A.

II : TIBLE - DKAHS

The diagonally opposite element is substituted by its immediate preceding alphabet in the English alphabetical series.

=> T is substituted by S at its diagonally opposite position. Similarly, I is substituted by H at its diagonally opposite position and similarly for B, L and E.

Following the above method, code for STABILISED is :

STABI - JCBUT

LISED - CDRHK

=> STABILISED - JCBUTCDRHK