I had attempted to make a map for parkour in beta 1.1 but it appears that in the beta test phase something broke the signs. Hope this helps!
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[Mod] Celesian
MCPE-21088
Sign will not allow me to move down to the next line
Resolved
Duplicate
0
[Mod] Celesian
migrated
(Unassigned)
Unconfirmed
Phone - Android - Samsung Galaxy S5
6.0
1.1.0.1
Retrieved
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-20759
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