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(e^ht * h * R0 *+ e^ht * h * R0 + e^ht * h * R0)(3(-1 + e^(h t)) +3(-1 +e^ht)
(e^ht * h * R0 *+ e^ht * h * R0 + e^ht * h * R0)(3(-1 + e^(h t)) +3(-1 +e^ht)
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