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