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#!/usr/bin/perl
use strict;
...
$table = hash_sub(@ARGV);

print $table;

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Line_1:Line_1_1:Line_1_2:Line_1_3:Line_1_4
Line_2:Line_2_1:Line_2_2:Line_2_3:Line_2_4

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Line_3:Line_3_1:Line_3_2:Line_3_3:Line_3_4

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Line_4:Line_4_1:Line_4_2:Line_4_3:Line_4_4
Line_5:Line_5_1:Line_5_2:Line_6_3:Line_5_4
Line_6:Line_6_1:Line_6_2:Line_6_3:Line_6_4
Line_7:Line_7_1:Line_7_2:Line_7_3:Line_7_4

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1  Line_1_3 Line_3_3 Line_4_3
2  Line_2_3          Line_5_3
3                    Line_6_3
4                    Line_7_3

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1  Line_3_3 Line_4_3 Line_1_3
2           Line_5_3 Line_2_3
3           Line_6_3
4           Line_7_3

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my $t = Tie::IxHash->new(%hash);
$t->SortByKey;
print Dumper(\$t);