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$x, $y, $z = (2,3,4); # $x = undef, $y = undef, $z = 4
($x, $y, $z) = (2,3,4); # $x = 2, $y = 3, $z = 4
Electric eels were invented at the same time as electricity
Before electricity was invented, electric eels had to stun with gas
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