Dear all: Hello. I'm a user of time zone data in IANA. Lately I found a problem when I used it in Android O system. external\icu\tools\update-tzdata.py I used the tool in the below path to deal with the data tzcode2017c.tar.gz<https://www.iana.org/time-zones/repository/releases/tzcode2017c.tar.gz>. Then the error occurred. Finally I found the way to solve it. It seemed that africa file and backzone file have a duplicated data: # South Sudan Zone Africa/Juba 2:06:24 - LMT 1931 2:00 Sudan CA%sT 2000 Jan 15 12:00 3:00 - EAT I deleted one in backzone, then it worked. Now I'm wondering if this is mistake. And what are the influences?