#!/usr/bin/perl -nl
# Use Perl's multi-byte alignment code, via sprintf, while
# performing a rudimentary check for duplicate names and
# removing duplicate name,email pairs.
use Encode;

BEGIN { my (%elide, %seen, %name) }

chomp;
my ($name, $email) = split '\0', decode ('UTF-8', $_);

if ($elide{"!$name"}) {
; # ignore this author
} elsif (index ($name, '!') == 0) {
  $elide{$name}++;
} elsif ($seen{$name}++) {
  warn "$0: NO-THANKS: duplicate name: $name\n";
} else {
  print encode ('UTF-8', sprintf ('%-36s', $name)), $email;
}