Proof #2 (2007)

Proof #3 (2007)

Proof #4 (2007)

Proof #5 (2007)

Proof #6 (2007)

Proof #7 (2007)

Proof #8 (2007)

Proof #9 (2007)

Proof #10 (2007)

Proof #11 (2007)

Proof #12 (2007)

Proof #13 (2007)

Proof #14 (2007)

Proof #17 (2007)

Proof #15 (2007)

Proof #18 (2007)

Proof #19 (2007)

Proof #20 (2007)

Proof #21 (2007)

Proof #22 (2007)

Proof #23 (2007)

Proof #24 (2007)

Proof #25 (2007)

Proof #26 (2007)

Proof #27 (2007)

Proof #28 (2007)