With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In baseball the Tucson Saguaros of the independent Pecos League started play in 2016 and play at Amphitheater High School. They won the league in their inaugural season. The Tucson Padres played at Kino Veterans Memorial Stadium from 2011 to 2013. They served as the AAA affiliate of the San Diego Padres. The team, formerly known as the Portland Beavers, temporarily moved to Tucson from Portland while the team awaited a new stadium in Escondido. Legal issues derailed the plans to build the Escondido stadium, so they moved to El Paso, Texas for the 2014 season. Previously, the Tucson Sidewinders, a triple-A affiliate of the Arizona Diamondbacks, won the Pacific Coast League championship and the off the record AAA championship in 2006. The Sidewinders played in Tucson Electric Park and were in the Pacific Conference South of the PCL. The Sidewinders were sold in 2007 and moved to Reno, Nevada after the 2008 season. They now compete as the Reno Aces.
text_B: Would you ever have found a formal contract signed between the Tucson Sidewinders and the Arizona Diamondbacks?
YES.