With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Dean Martin was an Italian-American vocalist.
text_B: `` Dear J '' is the debut solo single released by former AKB48 member Tomomi Itano .. Tomomi Itano. Tomomi Itano. AKB48. AKB48. It was released in four versions  : three regular CD+DVD editions and a limited theater CD-only edition .. First pressings of the regular editions came with a photo and an application card for tickets to a debut commemoration event , while all theater editions came with a handshake event ticket and a photo .. The title track was used as a Samantha Thavasa TV commercial song .. Samantha Thavasa. Samantha Thavasa. The second track of the theater edition , `` Tsundere ! ''. , is from Team A 's 5th stage .. The original was sung by Itano , Rie Kitahara , and Amina Sato , while the `` Dear J '' version was sung by Itano and the members of the AKB48 unit Natto Angels Z. Itano was a member of its original unit , Natto Angels .. AKB48. AKB48. Rie Kitahara. Rie Kitahara. Amina Sato. Amina Sato. The single reached number 2 on the Oricon weekly charts and charted for 24 weeks .. Oricon. Oricon
not_related.