Shingling over a valley

How do I shingle over a valley. Are there any pictures to show how this is done anywhere. Thanks

HEre is a step by step on how to shingle dims.: … inated.pdf

3tab here: … 2_3Tab.pdf

How to do valleys: … ng_etc.pdf

go to GAF.COM they have a video on the site to show how to do different valleys and other stuff.