use strict;
use warnings;
use open IN  => ':utf8';
use open OUT => ':utf8';
use Encode;

my $str = <<STR;
mv89psg6zh4	A bird in a sink keeps getting under the running water from a faucet.
mv89psg6zh4	A bird is bathing in a sink.
mv89psg6zh4	A bird is splashing around under a running faucet.
mv89psg6zh4	A bird is bathing in a sink.
mv89psg6zh4	A bird is standing in a sink drinking water that is pouring out of the facet.
mv89psg6zh4	A faucet is running while a bird stands in the sink below.
mv89psg6zh4	A bird is playing in a sink with running water.
mv89psg6zh5	A bird is playing in tap water.
mv89psg6zh5	A bird is bathing in the sink.
mv89psg6zh5	A bird is taking a bath.
STR

my %hash;

open my $inFile, '<:encoding(utf8)', \$str;
while (<$inFile>) {
    chomp;
    my ($video, $p) = split /\t/;
    push (@{$hash{$video}}, $p);
}

print "$_:\n   ", join ("\n   ", @{$hash{$_}}), "\n" for keys %hash;