Origin.
.
It appears that in tho area where this different pronunciation for e, ex, o and ox as A, jax, wa, wax respectively exists, the start was from e and o bat in tho latter part of tho sound thore came about more opening of the mouth which resulted in diphthongs ea, eax, oA, o ax which luter gavo ja, jax, wa, wax.
jadi Dia lebih Merasakan Dan menghayati.