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@a=(++$a." bottle$& of beer",on,the,wall),s/^/
Take one down and pass it around, @a.
Go to the store and buy some more, @a."
/s/until@c=(@b=(++$n,bottle.$&,of,beer),on,the,wall),s/^/Take one down
+ and pass it around, @c.
/;print$'."Go to the store and buy some more$&"