ABAP : logic OF and,or with ()

DATA : a, b, c, d, e, f, x, t.
x = 0. " mean false
t = 1. " mean true
*------
a = 1.
b = 1.
c = 1.
d = 1.
e = 1.
f = 1.
">>>>> no parentheses
*if a = t or
*   b = x and
*   c = t or
*   d = x and
*   e = t .
">>>>  no parentheses
  if  a = x or ( b = x and c = t ) or
   ( d = x and e = t ).
    WRITE : /'correct condition' COLOR 5.
  else.
    WRITE : /'incorrct condition' color 7.
  ENDIF.