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%hash{@array} >>++

%hash{$_}++ for @array

@added = @array1 >>+<< @array2;

## p5 code, I'm not completely fluent in p6 yet...

for ( my $i = 0; i < $#array1; i++ ) {
   $added[ $i ] = $array1[ $i ] + $array2[ $i ]
}