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→Analysis of contingent propositions: add example
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| (31)
| (31)
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-0.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-1.jpg|500px]]
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| [[Image:Equational Inference Bar -- Cast P.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-2.jpg|500px]]
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| [[Image:Equational Inference Bar -- Domination.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-3.jpg|500px]]
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| [[Image:Equational Inference Bar -- Cancellation.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-4.jpg|500px]]
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| [[Image:Equational Inference Bar -- Cast Q.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-5.jpg|500px]]
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| [[Image:Equational Inference Bar -- Domination.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-6.jpg|500px]]
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| [[Image:Equational Inference Bar -- Cancellation.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-7.jpg|500px]]
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| [[Image:Equational Inference Bar -- Cast R.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-8.jpg|500px]]
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| [[Image:Equational Inference Bar -- Cancellation.jpg|500px]]
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| [[Image:Proof (P (Q)) (P (R)) = (P (Q R)) 2-2-9.jpg|500px]]
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| [[Image:Equational Inference Bar -- DNF.jpg|500px]]
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| (33)
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