If any of these points are connected to each other, then we have found a triangle of three mutual friends.
如果这些点相互连接，我们得到一个三角形，有三对人互为朋友。
If any of these points are connected to each other, then we have found a triangle of three mutual friends. (these two points are connected, plus they are both connected to the original point).
如果这些点相互连接，我们得到一个三角形，有三对人互为朋友。(四个点中的两个点相连，加上它们又都与最初的一个点相连)。
If any of these points are not connected to each other, then we have found a triangle of three mutual strangers.
由此，我们得到一个互为陌生人的三角形。
If any of these points are not connected to each other, then we have found a triangle of three mutual strangers.
由此，我们得到一个互为陌生人的三角形。
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