Perhaps you should try some spelling variations:
"modified passive estimation algorithmss" » "modified passive estimation algorithm", "modified passive optimization algorithms", "modified passive estimation algorithms", "modified passive optimization algorithmss", "modified passive optimisation algorithms", "modified pose estimation algorithmss", "modified adaptive estimation algorithmss"
"modified objective estimation algorithms" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective allocation algorithms"

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