Concept:Arrange the letters of the word in alphabetical order, then shift each letter 2 places forward in the alphabet.Explanation:For TEACHER, alphabetical order is: A,C,E,E,H,R,T.Adding 2 to each letter gives: C,E,G,G,J,T,V.This matches the given code CEGGJTV.Now apply the same rule to CHILDREN.Letters in alphabetical order: C,D,E,H,I,L,N,R.Adding 2 to each letter gives: E,F,G,J,K,N,P,T.Therefore, CHILDREN is coded as EFGJKNPT.