With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Vallejo, California is in the United States.
text_B: A driver 's manual or handbook is a guide book -- usually small in size -- published by a national or subnational enforcement agency .. guide book. GUIdebook. driver. driver ( person ). The handbook provides basic information to help new and old drivers freshen up on driving skills .. Knowledge of the contents of the driver 's manual is tested in many jurisdictions as a prerequisite to issuing a driver 's license .. driver. driver ( person )
not_related.