#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11146507
use warnings;

for my $n ( 24, 25, 26 )
  {
  my $favorites = join '~~~', map "a|||b|||$_", 1 .. $n;

  my $favnums = join '',
    reverse map ',' . (split /\|{3}/ )[2],
    grep defined,
    ( split /~~~/, $favorites, 26 )[0 .. 24];

  print "n = $n\n\n$favorites\n\n$favnums\n\n";
  }

##</code><code>##

n = 24

a|||b|||1~~~a|||b|||2~~~a|||b|||3~~~a|||b|||4~~~a|||b|||5~~~a|||b|||6~~~a|||b|||7~~~a|||b|||8~~~a|||b|||9~~~a|||b|||10~~~a|||b|||11~~~a|||b|||12~~~a|||b|||13~~~a|||b|||14~~~a|||b|||15~~~a|||b|||16~~~a|||b|||17~~~a|||b|||18~~~a|||b|||19~~~a|||b|||20~~~a|||b|||21~~~a|||b|||22~~~a|||b|||23~~~a|||b|||24

,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1

n = 25

a|||b|||1~~~a|||b|||2~~~a|||b|||3~~~a|||b|||4~~~a|||b|||5~~~a|||b|||6~~~a|||b|||7~~~a|||b|||8~~~a|||b|||9~~~a|||b|||10~~~a|||b|||11~~~a|||b|||12~~~a|||b|||13~~~a|||b|||14~~~a|||b|||15~~~a|||b|||16~~~a|||b|||17~~~a|||b|||18~~~a|||b|||19~~~a|||b|||20~~~a|||b|||21~~~a|||b|||22~~~a|||b|||23~~~a|||b|||24~~~a|||b|||25

,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1

n = 26

a|||b|||1~~~a|||b|||2~~~a|||b|||3~~~a|||b|||4~~~a|||b|||5~~~a|||b|||6~~~a|||b|||7~~~a|||b|||8~~~a|||b|||9~~~a|||b|||10~~~a|||b|||11~~~a|||b|||12~~~a|||b|||13~~~a|||b|||14~~~a|||b|||15~~~a|||b|||16~~~a|||b|||17~~~a|||b|||18~~~a|||b|||19~~~a|||b|||20~~~a|||b|||21~~~a|||b|||22~~~a|||b|||23~~~a|||b|||24~~~a|||b|||25~~~a|||b|||26

,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1