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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def is_model_admin_subclass(node):
 """Checks that node is derivative of ModelAdmin class."""

    if node.name[-5:] != 'Admin' or isinstance(node.parent, ClassDef):
        return False

    return node_is_subclass(node, 'django.contrib.admin.options.ModelAdmin')