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  1. or download this
    print undef || "undef is false", "\n";
print 0 || "0 is false", "\n";
...
print '0xxx' || "'0xxx' is false", "\n";
print 'false' || "'0xxx' is false", "\n";
print '1' || "'0xxx' is false", "\n";
  2. or download this
    undef is false
0 is false
...
0xxx
false
1