proof 1

proof 2

proof 3

proof 4

proof 5

proof 6

proof 7

proof 8

proof 9

proof 10

proof 10 b

proof 12

proof 12 b

proof 13

proof 14

proof 15

proof 16

proof 17

proof 18

proof 19

proof 20

proof 21

proof 22

proof 23

proof 24

proof 11

proof 25

proof 26

proof 27