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  a) 's/\s*#.*//'
  b) '$_ = $` if /#/'
  c) '($_) = split/#/'
  d) '$_ = substr($_, 0, $-[0]) if /#/'
  e) 'if ((my $p = index($_, "#")) > -1) { substr($_, $p, -1, "") }'

   a) '{}'
   b) ''
   c) ';'
   d) All of the above
   e) None of the above

   a) '$_ = (split/#/)[0]'
   b) '($_) = split/#/'
   c) Too close to tell

   a) '$i = ""; $i = 1 if ($_ % 2) == 0'
   b) 'if (($_ % 2) == 0) {$i = 1} else {$i = ""}'
   c) Too close to tell

   a) '($str1, $str2) = split/:/ if /:/',
   b) 'if (/:/) {$str1 = $`; $str2 = $\'}',
   c) 'if (/:/) {$str1 = substr($_,0, $-[0]); $str2 = substr($_,$+[0])
+}'
   d) '($str1,$str2) = m/(\d*):(\d*)/ if /:/'
   e) Too close to call.

   $_ = "123:45678";
   
   foreach (1..2000000) {
      # snippet goes here ;
   }

   a) 'foreach (1..$n){$m = $_}'         
   b) '$m = $_ for (1..$n)'              
   c) 'for ($i=1;$i<$n+1;$i++) {$m = $i}'
   d) Too close to call.

   my ($i, $m);
   my $n = 5000000;
   # snippet goes here