You don't have to be rank 20 to do this.
You must have leveled the compass a total of 20 times.
It's not the same.
Because if you have to get to rank 20, then you just have to get to rank 20.
But you must have leveled the compass 20 times, but you are already starting with rank 1.
That means 1 + 20 = 21, simple math
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Oh I understand now... Thank u my friend