State whether the following elements form a set that is well defined set or not well defined.

1.capitals of all countries in asia___
2.First twenty counting numbers
3.all tall boys in grade 7-sapphire
4.all girl students in grade 7 Gold
5.all handsome men in grade 7-silver
6.all planets in the universe
7.first five letters of the english alphabet
8.the set of teachers in eupnhs
9.first twenty counting numbers
10.all colors in the rainbow


pls answer this seriously.
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