R. Vetsch Proof- 1R. Vetsch Proof- 2R. Vetsch Proof- 3R. Vetsch Proof- 4R. Vetsch Proof- 5R. Vetsch Proof- 6R. Vetsch Proof- 7R. Vetsch Proof- 8R. Vetsch Proof- 9R. Vetsch Proof- 10