OWL is encoded as 513212; DOVE is encoded as 40512250, then CRAB is encoded as

Information Given:
OWL → 513212
DOVE → 40512250
Find: CRAB → ?

Pattern: Each letter → digits of its position split

O (15) → 1,5 → written as 5,1 (reversed)

W (23) → 2,3 → 3,2

L (12) → 1,2 → 1,2

Thus:
OWL → (5,1)(3,2)(1,2) = 513212 ✔

Check with DOVE:

D = 4 → 04 → reversed → 40
O = 15 → 51
V = 22 → 22
E = 5 → 05 → reversed → 50

So:
DOVE → 40 51 22 50 = 40512250 ✔

C = 3 → 03 → reversed → 30
R = 18 → 1,8 → reversed → 81
A = 1 → 01 → reversed → 10
B = 2 → 02 → reversed → 20

So:
CRAB → 30 81 10 20

 Final Answer: