Dr Walton said :"our phone is being tapped by spies. We should code the message so that it will become difficult for others to understand." Holmes said: "OK. We will follow a colourful strategy instead of VIOLET, we will use INDIGO, for BLUE we use GREEN , for YELLOW we will use WHITE, and for ORANGE use BLACK". Walton said: "What do you mean by that ?" Holmes explained: "Under this technique KERALA will be coded as KHLARA and DELHI will be coded as DHRHN." What is the code for COCHI as per this strategy ?
ACHENN
BCBCHN
CKBKIR
DGEGVI