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line 1 have some string here and Hash_key_4: Hash_value_4_identical_to
+_Hash_value_9
line 2 have some string here and Hash_key_5: Hash_value_5
...
line 10 have some string here and Hash_key_10: Hash_value_10
....
....

Hash_key_1 => Hash_value_1
Hash_key_2 => Hash_value_2_identical_to_Hash_value_7
...
Hash_key_10 => Hash_value_10
....
....

my %hash = ();
my $filename = "input_text.txt";
...
       print "$line has $hash{$key} and value is $hash{key}\n";
    }
}