The code is a reverse of the alphabet. M is the 13th letter, so it is coded as N (14th letter).

C=3, A=1, B=2, B=2, A=1, G=7, E=5. Total = 3+1+2+2+1+7+5=21.

'D' corresponds to '4' in the same pattern.

'D' is the 4th letter in the alphabet, so it is coded as '4'.

E is the 5th letter; thus E=5.

Z is the 26th letter of the alphabet, so it corresponds to 26.

The pattern is +1; thus E corresponds to F.

The pattern is adding 3 to the letter. 'X' plus 3 is 'A'.

The pattern is shifting each letter forward by 3. 'C' corresponds to 'F'.

The pattern is that each letter is paired with its reverse in the alphabet. Thus, D corresponds to W.

The pattern is reversing the alphabet. 'X' corresponds to 'C'.

The pattern is reversing the alphabet, so 'C' corresponds to 'X'.

The pattern is reverse alphabet; C corresponds to X.

The pattern is reversing the alphabet. 'C' corresponds to 'X'.

The letters are in reverse order; B corresponds to Y.

C=3, A=1, T=20. D=4, O=15, G=7. So DOG = 415.

The letters are converted to their positions in the alphabet: C(3) + A(1) + T(20) = 3120. Similarly, D(4) + O(15) + G(7) = 4157.

Both pairs represent animals, and 'BIRD' is another type of animal that is commonly associated with 'FISH'.

The relationship is that the letters are reversed. Therefore, 'DOG' becomes 'GOD'.

Each letter is shifted by +1: C->D, I->J, R->S, C->D, L->M, E->F. Thus, SQUARE becomes TROFBS.

Each letter is shifted by +1. B -> C, I -> J, R -> S, D -> E. Therefore, BIRD = CJSF.

The pattern involves reversing the last two letters of the word. Thus, 'BIRD' becomes 'DBRI'.

The letters are rearranged: FISH -> HISF (last letter first), so BIRD -> RIBD.

Each letter is shifted by +1: W -> X, O -> P, R -> S, L -> M, D -> E. So, WORLD = XPSME.

Each letter is shifted by +3. W=23 becomes Z=26, O=15 becomes R=18, R=18 becomes U=21, L=12 becomes O=15, D=4 becomes G=7. Thus, WORLD = YQTNF.

Each letter is shifted by +1, so 'APPLE' becomes 'BQQMF'.

The letters are reversed in pairs; MANGO becomes ONAGM, so GRAPE becomes RGEAP.

Each letter is shifted by +1: M->N, O->P, U->T, S->T, E->F. Therefore, H->I, O->P, U->T, S->T, E->F, so HOUSE is coded as IPTVF.

The letters are reversed. Thus, DUST becomes STUD.

The letters are reversed. So RAT becomes TAR.