no. 1

no. 2
no. 3


 no 4.
no. 5
 no. 6

Solved
no. 7

Solved

no.8
no. 9


 no. 10

Solved

no. 11
 no. 12
no. 13
 no. 14
no. 15
 no. 16
no. 17

Solved
no. 18
no. 19
 no. 20
no. 21
 no. 22
no. 23
 no. 24
no. 25
 no. 26

no. 27

solved

 no. 28