Representatives for unipotent classes and nilpotent orbits

Let $G$ be a simple algebraic group over an algebraically closed field $k$ of characteristic $p$. The classification the conjugacy classes unipotent elements $G(k)$ and nilpotent orbits on $\operatorname{Lie}(G)$ is well-established. One knows there are representatives every class as product root orbit sum elements. We give explicit in terms Chevalley basis for eminent classes. A (resp. nilpotent) element said to if it not contained any subsystem subgroup subalgebra), or natural generalisation type $D_n$. From these representatives, straightforward generate given class. Along way we also prove recognition theorems identifying both exceptional groups.