Write a Python program that checks whether a specified value is contained within a group of values.

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def is_group_member(group_data, n):
   for value in group_data:
       if n == value:
           return True
   return False
print(is_group_member([1, 5, 8, 3], 3))
print(is_group_member([5, 8, 3], -1))