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# I hope this works:
@foobar = reduce {@a ^+ @b} @foo, @bar, @baz, @etc;
...

# ... or possibly this:
@foobar = reduce {$a ^+ $b} @foo, @bar, @baz, @etc;

@foobar = reduce {$a + $b} *(@foo, @bar, $baz, $etc);