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$t'$ parameter in XSL Attack

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In XSL Attack, $t'$ parameter can be defined as "the number of monomials in the S-Box equations to be used in $T'$ method" Without taking into account the arguments about the attack, how can we choose this parameter? Is it flexible or strictly determined?

For example in $ch 7.1$ and $7.2$ , $t'$ is chosen as $9$ or $5$ for AES and $5$ for Serpent respectively. What is the idea behind this choice?

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