In a certain code language, 'HORNS' is written as 'SLIMH', and 'PIRTA…

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:

H → (OPPOSITE) → S

O → (OPPOSITE) → L

R → (OPPOSITE) → I

N → (OPPOSITE) → M

S → (OPPOSITE) → H

AND

P → (OPPOSITE) → K

I → (OPPOSITE) → R

R → (OPPOSITE) → I

T → (OPPOSITE) → G

A → (OPPOSITE) → H

SIMILARLY

S → (OPPOSITE) → H

O → (OPPOSITE) → L

N → (OPPOSITE) → M

G → (OPPOSITE) → T