==================
Identifiers
==================

abc12

---

(source (identifier))

==================
Negation
==================

!abc

---

(source (not (identifier)))

==================
And/Or
==================

a || b && c && d

---

(source
  (or
    (identifier)
    (and
      (and (identifier) (identifier))
      (identifier))))

==================
Expressions
==================

a && (b == c || d != e)

---

(source
  (and
    (identifier)
    (parenthesized (or
      (equal (identifier) (identifier))
      (not_equal (identifier) (identifier))))))