What you want is inheritance. You wish to inherit some of the properties of this other class. Check perl for the list of OO related man pages. Suffice it to say, it's not too complicated. You need to create your new class, within that class use the parent class (that from which you inherit) and then fiddle with @ISA (eg; @ISA = 'Class::Parent').

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perl -pew "s/\b;([mnst])/'$1/g"