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{\bf R. Julian R. Abel, Diana Combe, Adrian M. Nelson and William D. Palmer}
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{\bf GBRDs with Block Size Three over 2-Groups, Semi-Dihedral Groups and Nilpotent Groups}
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There are well known necessary conditions for the existence of a
generalized Bhaskar Rao design over a group $\mathbb{G}$, with block
size $k=3$.  We prove that they are sufficient for nilpotent groups
$\mathbb{G}$ of even order, and in particular for $2$-groups.  In
addition, we prove that they are sufficient for semi-dihedral groups.



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