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  1. or download this
    $_='Us ? The bus usually waits for us, unless the driver forgets us.';
  2. or download this
    $_='Us ? The bus usually waits for us, unless the driver forgets us.';
print "$_\n";
s/\b([Uu])s(\W)/chr(ord($1)-1).hem.$2/eg;
print "$_\n";
  3. or download this
    $_='Us? The bus usually waits for us, unless the driver forgets us.';
print "$_\n";
s/\bus\b/them/ig;
print "$_\n";