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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 document_path_path(cls, project, database, document_path):
 """Return a fully-qualified document_path string."""

        return google.api_core.path_template.expand(
            "projects/{project}/databases/{database}/documents/{document_path=**}",
            project=project,
            database=database,
            document_path=document_path,
        )