Perhaps you should try some spelling variations:
"modified invasive estimation algorithmss" » "modified invasive estimation algorithm", "modified invasive optimization algorithms", "modified invasive estimation algorithms", "modified invasive optimization algorithmss", "modified invasive optimisation algorithms", "modified invasive ventilation algorithmss", "modified passive 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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