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my $book    := open a.xml ;
my $catalog := open b.xml ;
...
copy $book/book append $catalog/catalog ;

save :b $catalog ;

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,