In a certain code language, 'SIGNAL' is coded as 'H18T13Z15', and 'TARGET' is coded as 'G26I20V7'. How will 'VOLUME' be coded in that language?

E12O6N22

1   2    3    4   5    6   7     8    9  10  11  12  13

 A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

**********************************************************

THE LOGIC FOLLOWED HERE IS :

ALPHABET OPPOSITE TO GIVEN ALPHABET AND THEIR POSITIONAL VALUE OPPOSITE TO GIVEN ALPHABET  ARE USED ALTERNATLY

S → (OPPOSITE) → H

I → (OPPOSITE) → R →(PLACE VALUE) → 18

G → (OPPOSITE) → T

N → (OPPOSITE) → M →(PLACE VALUE) → 13

A → (OPPOSITE) → Z

L → (OPPOSITE) → O →(PLACE VALUE) → 15

AND

T → (OPPOSITE) → G

A → (OPPOSITE) → Z →(PLACE VALUE) → 26

R → (OPPOSITE) → I

G → (OPPOSITE) → T →(PLACE VALUE) → 20

E → (OPPOSITE) → V

T → (OPPOSITE) → G →(PLACE VALUE) → 7

SIMILARLY

V → (OPPOSITE) → E

O → (OPPOSITE) → I →(PLACE VALUE) → 12

L → (OPPOSITE) → O

U → (OPPOSITE) → F →(PLACE VALUE) →  6

M → (OPPOSITE) → N

E → (OPPOSITE) → V →(PLACE VALUE) → 22