One day, in the future, a magician wants to show that he can see the future.
To prove this, he shows the next world cup winner.
The world cup is entering half quarter final, so there are 8 countries competing.
He creates 3 4x5 tables, and shows it to the public.
But the tables are encrypted, he has the key.
Ha says each table represents a letter, so the 3 tables represent the country code in 3 letters.
He says, he is not showing the country name directly, because it is against the universe law.
He will reveal the name after the final competition.
For example if China is the winner,
after applying his chiper key, to every cell, the tables will seem like this :
The key is checking each cell, if it right the cell will turned red,
and if it wrong the cell will disappear.
Of course this is only his magic trick.
Actually he has put all the 8 countries code to his tables,
he just have to give the right key (he has 8 keys, each key reveal a country) to reveal the winner.
What are the country codes ?
what are the keys to reveal the countries code ?