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Shared intrest
cladograms
Convenient Calendar is an excellent free shared online calendar for families, friends, groups, etc. It also has a shared address book and photo album for your groups. I personally use it for my family and a few recreational sports groups and recommend the site.
Most interest groups are founded based on their members' shared economic interests. They are advocating for their own self-interests.
"conservative" seems like a good word to describe their policy.
Culture
separation of powers
copritives
island silicates (0 shared oxygen) disilicates (1 shared) single chain silictes (2 shared) ring silicates (aka double chain silicates) (2 or 3 shared) sheet silicates (3 shared) framework silicates (4 shared)
power shared between different organs of government(horizontal power sharing) power shared between different levels of government(vertical power sharing) power shared among different social groups power shared among different political parties,pressure groups,etc
Minimus
the more derived characteristics shared by groups, the more recently the groups share a common ancestor