Perhaps you should try some spelling variations:
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"variance function from working program" » "variance functions from working program" (Expand search), "covariance function from working program" (Expand search), "covariance functions from working program" (Expand search), "variance function from walking program" (Expand search), "variance function from deworming program" (Expand search), "variance function from stocking program" (Expand search), "variance function from work program" (Expand search), "variance function co working program" (Expand search), "variance function team working program" (Expand search)

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