On first examination of our present example we made a likely guess at a form of rule that
+
would account for the finite protocol of states that we observed the system <math>X\!</math> passing through, as spied in the light of its boolean state variable <math>x : X \to \mathbb{B},</math> and that rule is well-formulated in any of these styles of notation:
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Way back in DATA Note 3, we guessed, or "abduced",