Properties like phase or type are typified, accepting only certain values. Some of these queries will help you get the valid values from a specific property.
phase
type
Non-typified properties, like name or title, are expected to be all different.
name
title
contact
g.V().hasLabel('contact').values('type').dedup()
dossier
g.V().hasLabel('dossier').values('phase').dedup()