foreach (%challenge) {
  $i; wait;
  $i =~ study each %challenge;

  foreach ($programming{language}) {
    $i = tr/y/$_/;
    $i; push @away and goto Perl;
    $no. sub { FOR: { $perl } } if $Perl{exists};
  }

AND:
  foreach ($problem{solved}) {
    my $knowledge++ and $Perl{love}++;
  }
}