Oops - used or instead of or/c.
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os2.rkt
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os2.rkt
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@ -265,7 +265,7 @@
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(define state/c (not/c transition?))
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(define state/c (not/c transition?))
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(define action/c action?)
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(define action/c action?)
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(define action-tree/c (flat-rec-contract action-tree/c
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(define action-tree/c (flat-rec-contract action-tree/c
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(or action/c
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(or/c action/c
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null?
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null?
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(cons/c action-tree/c action-tree/c))))
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(cons/c action-tree/c action-tree/c))))
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