Question: This use - after - free attack on Fast bins will still work if we allocated and then freed 9 size 0 x 2 0

This use-after-free attack on Fast bins will still work if we allocated and then freed 9 size 0x20 chunks instead of 10 here.
[ Select ]["True", "False"]
(2)
This use-after-free attack on Fast bins will still work if we allocated and then freed 8 size 0x20 chunks instead of 10 here.
[ Select ]["True", "False"]
(3)
This use-after-free attack on Fast bins will still work if we allocated and then freed 7 size 0x20 chunks instead of 10 here.

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