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Use nondeterministic choice by default instead of a deterministic bitstream
generator in the state, which is slightly awkward to reason about, because
every use of undefined_boolS changes the state. The previous behaviour can be
implemented as Sail code, if desired.
Also add a default implementation of internal_pick that nondeterministically
chooses an element from a list.
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resolving the difference in type parameters between the prompt and state
monads, and allowing a single output file to be used with either.
Normally, the type alias is to the prompt monad, but for HOL4 we use the
state monad.
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(still needs some Lem work on types before it will be useful)
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