Hi, great article! I had a bit of trouble to understand the big picture in Quatum Search over 2 Qubits section.
First time I saw the example I failed to see any benefit --- after all in the first step I mark the correct answer using the f00, f01, f10 or f11 buttons and then all the algorithm does is making the state with inverted phase to be 100% likely.
Maybe it could be improved by
stressing it is about inverting the function, in your example it was oracle function
the function is called once, but changes all the four states (am I right?); this is the mindblowing part
could you provide example of concrete function that works on two qubits
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