Perhaps you should try some spelling variations:
"defined network estimation algorithmss" » "defined network estimation algorithm", "defined network optimization algorithms", "defined network estimation algorithms", "defined network optimization algorithmss", "defined network optimisation algorithms", "designed network estimation algorithmss"
"modified parameters estimation algorithms" » "modified parameter estimation algorithms", "modified parameter estimates algorithms", "modified parameter optimization algorithms", "modified parameters estimation algorithm", "modified parameters optimization algorithms", "modified parameters optimisation algorithm"

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