As posterior frontanalle closes earlier than anterior one, and before that let us remember 4 digits
3
6
9
18
So starting from posterior fromtonalle
It has 2 digits 3 and 3×2=6, i.e., 3-6 months
And now anterior fromtonalle
It has 9 and 18 (9×2) i.e., 9-18 months.
I hope it will work for beginners
Thank you
Allah Hafiz.
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