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> perl -e 'my $x = "0.01 NaN 2.30 4.44";
  my ($d, $e, $f, $g) = ($x =~ /([Na0-9\.\-\0]+\b)/g);
  print "d: $d, e: $e, f: $f, g: $g";'

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```
d: 0.01, e: NaN, f: 2.30, g: 4.44
```