User blog comment:Googleaarex/Pair sequence number analysis/@comment-27516045-20170725134920/@comment-32697988-20171009193414

Bashicu said that (0,0)(1,1)(2,2)(3,0)(2,1)(3,1)(4,1) expands differently with bm1 and bm2. It is a pair sequence that can be result from expanding (0,0,0)(1,1,1).