They are often only marked as PRIVATE. All packaging must be marked likewise. In various countries, borders may be poorly marked. Likewise, borders may be marked and warnings. However, initial glottal stops are usually not marked. As of 2009, all remaining minefields are clearly marked. The 1920s immediately after the war was marked by instability. Vowels are not usually marked in abjads. In most areas the trail is well marked. Later releases have marked changes in the band. Initially, the trail was not marked or named. The era was also marked by economic instability. Additionally, all nouns must be marked for number. The period was also marked by strife and tragedy. These are holidays that are not traditionally marked on calendars.