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I know the Perl -p flag is counted as one byte. I've just added the Perl bignum library to my answer to make it shorter. I'm using it like this: perl -p -Mbignum filename.pl. How many bytes does it count as?

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People usually count -p as one byte because perl -pE has a distance of 1 to perl -E (arguably the default). If you require reading the source code from a file for some reason, -p would count as three bytes, as perl -p file.pl has a distance of 3 to perl file.pl.

Likewise, perl -p -Mbignum file.pl has a distance of 9 to perl -p file.pl, so it comes at a 9 byte score penalty.

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