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print "$amount $currency_from = ", $amount * $ratio, " $currency_to\n"
$ perl exchange.pl 100 usd eur
100 USD = 70.22 EUR
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
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