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/usr/share/cmigemo/tools/optimize-dict.pl is in cmigemo-common 1:1.2+gh0.20150404-2.

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#!/usr/bin/perl -w
# vim:set ts=8 sts=4 sw=4 tw=0:
# 
# optimize-dict.pl
#
# Last Change: 21-Jan-2005.
# Written By:  MURAOKA Taro <koron@tka.att.ne.jp>

binmode STDOUT;
my %migemo;
my @migemo;

# Read migemo-dict file.
while (<>)
{
    chomp;
    next if /^;/;
    my ($label, @word) = split /\t/;
    $label = lc($label); # Key must be lower case
    push @migemo, $label;
    push @{$migemo{$label}}, @word;
}

@migemo = sort {length($b) <=> length($a) or $a cmp $b} @migemo;

# Write migemo-dict file.
my $i;
for ($i = 0; $i < @migemo; ++$i)
{
    my $label = $migemo[$i];
    if (exists $migemo{$label})
    {
	print "$label\t" . join("\t", &uniq_array($migemo{$label})) . "\n";
	delete $migemo{$label};
    }
}

sub uniq_array
{
    my %array = map {$_, 1} @{$_[0]};
    return keys %array
}