Question: 1. Are two heads are better than one ? 2 PDA stacks, will it be more powerful? 2. determinism: some machines are deterministic, some aren't.

1. Are two heads are better than one ? 2 PDA stacks, will it be more powerful?

2. determinism: some machines are deterministic, some aren't. they are total functions, always defined. if you are deterministic, how does the machine ever stop?

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