#!/usr/bin/env perl
use strict; use warnings;

my %teams = (
    NFL => { JETS    => 1, PATRIOTS => 1, GIANTS    => 1 },
    MLB => { YANKEES => 1, METS     => 1, CARDINALS => 1 },
    NBA => { SIXERS  => 1, CELTICS  => 1, LAKERS    => 1 },
);

my %actual_teams;

while ( <DATA> ) {
    chomp;
    my ( $league, $team ) = split /,/;
    $actual_teams{ $league }->{ $team } = 1;
}

foreach my $league ( keys %teams ) {
    foreach my $team ( keys %{ $teams{ $league } } ) {
        if ( not $actual_teams{ $league } or not $actual_teams{ $league }->{ $team } ) {
            print "MISSING:\tLEAGUE: $league\tTEAM: $team\n"
        }
    }
}

__DATA__
NFL,JETS
NFL,PATRIOTS
MLB,YANKEES
MLB,CARDINALS
MLB,METS
NBA,SIXERS
NBA,CELTICS
NBA,LAKERS