grammar tool
G = (
V:
T:
P:
S -> 0 | A A -> 1B | 2B | 3B | 4B | 5B | 6B | 7B | 8B | 9B B -> 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | {} | BB
S:
)
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