Perhaps you should try some spelling variations:
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"variance function from leasing program" » "variance functions from leasing program" (Expand search), "covariance function from leasing program" (Expand search), "covariance functions from leasing program" (Expand search), "variance function from learning program" (Expand search), "variance function from learning programs" (Expand search), "variance function from teaching program" (Expand search), "variance function from leading program" (Expand search), "variance function from leaching program" (Expand search)

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