“…Wilf's conjecture, as it is now known, has been verified in several cases, including when |P | 3, or c 3m, or m 18, or |L| 12, or |P | m/2. See Delgado [5] for an extensive recent survey of partial results on Wilf's conjecture, and [1,2,4,9,11,13,14,15,17,20,21,22] for some relevant papers. The verification in case |P | m/2 is due to Sammartano [20] in 2012.…”