BST question

[tiny scaffold]

Hello, I am currently learning DSA and I saw that keys in a BST can't be duplicate, yet how can they use 5 twice in this BST?

[dawn temple]

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[foggy fossil]

A BST can contain equal elements, in this case it would represent a multiset.

[dry musk]

a BST could use "left child has elements < the root, right child has elments >= the root" to allow duplicates