Now that I understand the problem, here is a correct working solution that is relatively fast (8 seconds locally). Running it through

indicates it is 42 lines. It isn't very clean as I didn't have very much time to implement. If I have time, I will see about clarity and optimizations. If nothing else, I will add comments tomorrow so at least the algorithm is clear even if the code is not.

`#!/usr/bin/perl
use strict;
use warnings;
my %l = (
E => 0, e => 0, J => 1, j => 1, N => 1, n => 1, Q => 1, q => 1, R
+=> 2, r => 2,
W => 2, w => 2, X => 2, x => 2, D => 3, d => 3, S => 3, s => 3, Y
+=> 3, y => 3,
F => 4, f => 4, T => 4, t => 4, A => 5, a => 5, M => 5, m => 5, C
+=> 6, c => 6,
I => 6, i => 6, V => 6, v => 6, B => 7, b => 7, K => 7, k => 7, U
+=> 7, u => 7,
L => 8, l => 8, O => 8, o => 8, P => 8, p => 8, G => 9, g => 9, H
+=> 9, h => 9,
Z => 9, z => 9
);
my ($fh, %data);
open($fh, '<', 'dictionary.txt') or die "Unable to open 'dictionary.tx
+t' for reading: $!";
while (<$fh>) {
chomp;
eval join '', 'push @{$data', (map {defined $l{$_} ? "{$l{$_}}" :
+()} split //, $_), "{nodes}}, '$_';";
}
open($fh, '<', 'input.txt') or die "Unable to open 'input.txt' for rea
+ding: $!";
while (<$fh>) {
chomp;
my $num = join '', /(\d+)/g;
my $end = length($num) - 1;
print "$_: $num\n" and next if ! $end;
my @solution = [["$_:"], 0, 0];
while (@solution) {
my ($tree, $work) = (\%data, pop @solution);
my ($found, $first) = (0, substr($num, $work->[1], 1));
for my $pos ($work->[1] .. $end) {
my $dig = substr($num, $pos, 1);
if (! exists $tree->{$dig}) {
push @solution, [[@{$work->[0]}, $first], $work->[1] +
+ 1, 1] if ! $work->[2] && ! $found++;
last;
}
$tree = $tree->{$dig};
if (exists $tree->{nodes} && ++$found) {
if ($pos == $end) {
print join(' ', @{$work->[0]}, $_), "\n" for @{$tr
+ee->{nodes}};
last;
}
if ($end - $pos == 1) {
my $last_dig = substr($num, $end, 1);
print join(' ', @{$work->[0]}, $_, $last_dig), "\n
+" for @{$tree->{nodes}};
last if ! exists $tree->{$last_dig} || ! exists $t
+ree->{$last_dig}{nodes};
}
push @solution, [[@{$work->[0]}, $_], $pos + 1, 0] for
+ @{$tree->{nodes}};
}
}
push @solution, [[@{$work->[0]}, $first], $work->[1] + 1, 1] i
+f ! $work->[2] && ! $found;
}
}
`

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