Can someone explain to me what this transition means here: a, Z : AZ

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Can someone explain to me what this transition means here: a, Z : AZ

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This question lacks context but from what I infer I think it means that whenever you're in a configuration such that you are reading $a$ and $Z$ is on top of the stack then you replace the top of the stack by $AZ$.

That is you have the following transition $(q_0,aw',Z\gamma) \vdash (q_0, w', AZ\gamma)$ for $w' \in \{a,b\}^*$ and $\gamma \in \{A,Z\}^*$.