def setUp(self):
self.G = Grammar.from_text("""
E → TA
A → +TA | ɛ
T → FB
B → ∗FB | ɛ
F → (E) | a
""")
self.G2 = Grammar.from_text("""
S → ABC
A → ɛ
B -> ɛ
C → ABd
""")
self.G3 = Grammar.from_text("""
S → ABC
A → aA | ɛ
B → b | ɛ
C → c | d
""")
self.G4 = Grammar.from_text("""
S → (S) | a
""")
self.G5 = Grammar.from_text("""
S → Aa | Bb | ac
A → a
B → a
""")
self.G6 = Grammar.from_text("""
E → E*B | E+B | B
B → 0 | 1
""")
