Question: A pushdown automaton can end its computation in an unbounded sequence of epsi - moves. This behaviour can be avoided for general PDA, indeed.

A pushdown automaton can end its computation in an unbounded sequence of
\epsi
-moves. This behaviour can be avoided for general PDA, indeed. For each PDA there is an equivalent PDA without
\epsi
-moves. This is equivalent to Greibach Normal Form for grammars.
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