Smith in 1977 [@Smith77]. However, the smallest possible example of such a GHD with $v\equiv 0 \pmod 6$ is for $v=18$ and $s=8$; these were recently obtained and classified up to isomorphism in [@Finland], from which the following example is taken.

\[FinlandExample\] The following is a ${\mathrm{GHD}}(8,18)$, or equivalently a $\mathrm{DRNKTS}(18)$.

$$\begin{array}{|c|c|c|c|c|c|c|c|} \hline
    &       & agh & bkm & ejp & fir & clq & dno \\ \hline
      &       & bln & aij & cho & dgq & ekr & fmp \\ \hline
acd & boq &       &     & gmr & hkp & fjn & eil \\ \hline
bpr & aef &     &       & inq & jlo & dhm & cgk \\ \hline
fgl & dik & emq & cnr &       &       & aop & bhj \\ \hline
ehn & cjm & fko & dlp &       &       & bgi & aqr \\ \hline
imo & gnp & djr & fhq & akl & bce &       & \\ \hline
jkq & hlr & cip & ego & bdf & amn &       & \\ \hline
\end{array}$$

The existence of Kirkman squares was settled by Colbourn, Lamken, Ling and Mills in [@CLLM], with 23 possible exceptions, 11 of which where solved in [@ALW] 