1 Correction to: J Comb Optim https://doi.org/10.1007/s10878-018-0287-5

The original version of the article contained a mistake. In page 2, second paragraph, line 7, the word “and” was inadvertently missed. The corrected sentence is “For example \({T} (n_1)..... {t} \le k-1\) and \(n_{t +1},\ldots , n_k \ge 2,....\)”.

The original article has been corrected.