Semantics of a word
If Tomato is Tamatar,

T(o)mat(o).
T(a)mat(ar).

(o) = (a)&(ar)

T(o)mat(o).
P(o)tat(o).

P(o)tat(o).
P(a)tat(ar).

then why is Potato not Patatar?

OR

If (P)otato is (A)lu,

(P)otato.
(A)<BCDEFGHIJKLMNO<(P)QRSTUVWXY.

(A)lu.
ABCDEFGHIJKLMNO(P)>QRS>(T)UVWXY.

(T)omato.
(A)>BCD>(E)FGHIJKLMNOPQRSTUVWXY.

(E)lu.

then why is Tomato not Elu?