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Deterministic uniquely-accepting PDA for $\{ w \in \{a,b\}^* \mid 2|w|_a\leq|w|_b \}$

Write a **deterministic uniquely-accepting** PDA recognizing the words over
$\{a,b\}$ such that the number of occurrences of $b$ is at least twice the
number of occurrences of $a$.

Authors: Guillem Godoy
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