Merge branch 'develop'
Merge https://github.com/oo7/Duo
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
write section34
Correct index
Merge branch 'master' into develop
change fileformat
writing section35 and 36
write section37
writing section38
write 37, 38, 39, and 40
Writing section41.
writing section42 and correct section40 and 41
writing section42 and 43