“…in X 3 , these solutions found increasing attention during the past thirty years (see, e. g., [30,12,29,15,10,19,21,4,5,14,11,6,7,8,23,1,18,25,26,27,28]. Due to their close connection with braidings, they arise in various topics, including non-commutative regular rings [13,14], regular affine groups [4,2,3], Hopf-Galois theory [11,6,16,1], and Garside groups [7,8,23].…”