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{| align="center" cellpadding="8" style="text-align:center"
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1 Head.jpg]]
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|-
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-1.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-2.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-3.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-4.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-5.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-6.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-7.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-8.jpg]]
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| [[Image:PERS (P (Q)) (P (R)) = (P (Q R)) Proof 2-1-9.jpg]]
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|}
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