To stay in shape, Sherlock and Liam play this game where they make a bet. Liam tries to hide and Sherlock tries to catch him. Time is one day and area is whole London. All tools and asking help from others is allowed. If Sherlock catches Liam before sunset, he gets to decide how they spend their night and if he doesn't Liam will give him a "punishment". Either way it's a win-win (unless Sherlock makes Liam listen about different types of cigarette ashes for whole nigh or Liam's punishment is advanced math lessons).
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