Explicit $H_3$ relation in the diagrammatic Hecke category

We compute the missing three-color relation in type $H_3$ as an explicit $R$-linear combination of double leaves. The expression has $43\,424$ nonzero polynomial coefficients with scalars in $\mathbb{Z}[φ]$, where $φ= (1 + \sqrt{5})/2$. We verify the relation using exact arithmetic in the computer a