# Install dependencies
Something that used to come naturally is now a subject of longing and fascination, as if it were a rare anthropological phenomenon. Videos are springing up on social media, cataloguing encounters with the unknown “other”: earnest, well-meaning, wholesome videos, under the categories “social anxiety”, “extrovert” and “talking to strangers”. Many have the unstated theme of “out and about in the big city”. Some are personal experiments, often extremely ill-advised ones. Can you challenge yourself to tell a joke to an entire train carriage? What happens if you go up to an older woman and tell her she looks beautiful? The (usually young) person doing the filming is often trying to improve themself in some way or attempting to “be braver” or “less socially anxious”. The camera acts as their accountability partner. The people they’re talking to are relegated to the role of “task to be ticked off the list”. Either that or there’s a push towards a Hallmark card effect: “Look, other people are not as horrible as you thought.” (Cue swell of trending motivational audio.)
，更多细节参见新收录的资料
Now let’s revisit the selector wildcard examples from the beginning using BPatterns.
This gets at an important point: the permissions guarding a page of memory are associated with the virtual address used to access that page, not the physical frame that backs the page. Indeed the notion of memory permissions is purely a consideration of virtual memory and does not pertain to physical memory.
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