With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Prussia became part of a unitary state.
text_B: La Spezia Naval Base is one of the Italian Navy 's most important and historic bases .. Italian Navy. Italian Navy. La Spezia. La Spezia. The base lies in the central-western zone of the Gulf of Spezia , close to the historic centre of La Spezia .. Gulf of Spezia. Gulf of Spezia. La Spezia. La Spezia
not_related.