Update plan.txt
Update calculating_fall.txt
Merge pull request #14 from Schreiadler/patch-1

Update plan.txt
Merge pull request #15 from Schreiadler/patch-2

Update calculating_fall.txt
Update plan.txt
Merge pull request #16 from Schreiadler/patch-3

Update plan.txt
Update info_pics.txt
Merge pull request #17 from Schreiadler/patch-4

Update info_pics.txt