Perhaps you should try some spelling variations:
"modified write estimation algorithmss" » "modified write estimation algorithm", "modified write optimization algorithms", "modified write estimation algorithms", "modified write optimization algorithmss", "modified write optimisation algorithms", "modified risk estimation algorithmss", "modified pose estimation algorithmss"
"modified stochastic estimation algorithms" » "modified stochastic optimization algorithms", "modified stochastic estimation algorithm", "modified stochastic optimisation algorithm"

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