Decompositions of complete symmetric directed graphs into the oriented heptagons

The complete symmetric directed graph of order $v$, denoted by $K_{v}$, is the on $v$~vertices that contains both arcs $(x,y)$ and $(y,x)$ for each pair distinct vertices $x$ and~$y$. For a given $D$, set all $v$ which $K_{v}$ admits $D$-decomposition called spectrum of~$D$-decomposition. There are 10 nonisomorphic orientations $7$-cycle (heptagon). In this paper, we completely settled problem oriented heptagons.