Rust

use std::fs::File;
use std::io::{BufReader, BufRead};
use std::collections::BTreeSet;

fn run(name:&str) -> Result<(), std::io::Error> {
    let set = BufReader::new(File::open(name)?)
        .lines()
        .collect::<Result<BTreeSet<String>, _>>()?;
    for line in &set { println!("{}", line); }
    Ok(())
}

fn main(){
    println!("*** Example ***");
    run("inp.txt").unwrap();
    println!("*** Challenge ***");
    run("inp2.txt").unwrap();
}

Output:

*** Example ***
5181    0   7   I've seen things you people wouldn't 
5181    1   7   believe. Attack ships on fire off the 
5181    2   7   shoulder of Orion. I watched C-beams 
5181    3   7   glitter in the dark near the Tannhäuser 
5181    4   7   Gate. All those moments will be lost 
5181    5   7   in time, like tears in rain. Time to die.
5181    6   7    
6220    0   10  We have to chase him. 
6220    1   10  Because he's the hero Gotham deserves, 
6220    2   10  but not the one it needs right now. 
6220    3   10  So we'll hunt him. 
6220    4   10  Because he can take it. 
6220    5   10  Because he's not a hero. 
6220    6   10  He's a silent guardian. 
6220    7   10  A watchful protector. 
6220    8   10  A Dark Knight. 
6220    9   10   
*** Challenge ***
1938    0   17  You read the Bible, Brett? Well there's 
1938    1   17  this passage I got memorized, sorta fits 
1938    10  17  And I will strike down upon thee with 
1938    11  17  great vengeance and furious anger those 
1938    12  17  who attempt to poison and destroy my 
1938    13  17  brothers. And you will know my name is 
1938    14  17  the Lord when I lay my vengeance upon 
1938    15  17  thee." 
1938    16  17   
1938    2   17  this occasion. Ezekiel 25:17? "The path 
1938    3   17  of the righteous man is beset on all sides 
1938    4   17  by the iniquities of the selfish and the 
1938    5   17  tyranny of evil men. Blessed is he who, 
1938    6   17  in the name of charity and good will, 
1938    7   17  shepherds the weak through the valley 
1938    8   17  of darkness, for he is truly is brother's 
1938    9   17  keeper and the finder of lost children. 
2997    0   19  Did you ever hear the tragedy of Darth
2997    1   19  Plagueis the Wise? I thought not. It's not a
2997    10  19  consider to be unnatural. He became so 
2997    11  19  powerful...The only thing he was afraid of was
2997    12  19  losing his power. Which eventually, of course,
2997    13  19  he did. Unfortunately, he taught his
2997    14  19  apprentice everything he knew, then his
2997    15  19  apprentice killed him in his sleep. Ironic,
2997    16  19  he could have others from death, but not
2997    17  19  himself. 
2997    18  19   
2997    2   19  story the Jedi would tell you. It's a Sith
2997    3   19  legend. Darth Plagueis was a Dark Lord of the
2997    4   19  Sith so powerful and so wise, he could use the
2997    5   19  Force to influence the midichlorians to
2997    6   19  create life...He had such a knowledge of the
2997    7   19  dark side that he could even keep the once he
2997    8   19  cared about from dying. The dark side of the
2997    9   19  Force is a pathway to many abilities some
6450    0   11  Voilà! In view, a humble vaudevillian veteran, cast vicariously as both victim 
6450    1   11  and villain by the vicissitudes of fate. This visage, no mere veneer of vanity, 
6450    10  11   
6450    2   11  is a vestige of the vox populi, now vacant, vanished. However, this valorous 
6450    3   11  visitation of a bygone vexation stands vivified, and has vowed to vanquish these 
6450    4   11  venal and virulent vermin vanguarding vice and vouchsafing the violently vicious 
6450    5   11  and voracious violation of volition! The only verdict is vengeance; a vendetta 
6450    6   11  held as a votive, not in vain, for the value and veracity of such shall one day 
6450    7   11  vindicate the vigilant and the virtuous. Verily, this vichyssoise of verbiage 
6450    8   11  veers most verbose, so let me simply add that it's my very good honour to meet 
6450    9   11  you and you may call me V.
7469    0   7   I've seen things you people wouldn't 
7469    1   7   believe. Attack ships on fire off the 
7469    2   7   shoulder of Orion. I watched C-beams 
7469    3   7   glitter in the dark near the Tannhäuser 
7469    4   7   Gate. All those moments will be lost 
7469    5   7   in time, like tears in rain. Time to die.
7469    6   7    
9949    0   10  We have to chase him. 
9949    1   10  Because he's the hero Gotham deserves, 
9949    2   10  but not the one it needs right now. 
9949    3   10  So we'll hunt him. 
9949    4   10  Because he can take it. 
9949    5   10  Because he's not a hero. 
9949    6   10  He's a silent guardian. 
9949    7   10  A watchful protector. 
9949    8   10  A Dark Knight. 
9949    9   10