missing failure list including F10

Name: Johannes Koch
Email: johannes.koch@fit.fraunhofer.de
Affiliation: 
Document: UW
Item Number: Understanding Success Criterion 2.1.2
Part of Item: Common Failures
Comment Type: editorial
Summary of Issue: missing failure list including F10
Comment (Including rationale for any proposed change):
no list of common failures, whereas the Techniques document has F10 for failing sc2.1.2

Proposed Change:
add list of common failures listing F10