Untested: 
use autodie;
open my $fh, "<", $input_filetuple;
my %data;   # Collects data
while (<$fh>) {
    chomp;
    my ($key, undef, undef, $value) = split;
    push @{$data{$key}}, $value;
}

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In reply to Re: Array of arrays? by JavaFan
in thread Array of arrays? by remluvr

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