  For positive integers $s,t,u,v$, we define a bipartite graph
$\Gamma_{\mathbb{R}}(X^s Y^t,X^u Y^v)$ where each partite set is a copy of
$\mathbb{R}^3$, and a vertex $(a_1,a_2,a_3)$ in the first partite set is
adjacent to a vertex $[x_1,x_2,x_3]$ in the second partite set if and only if
  \[
  a_2 + x_2 = a_1^s x_1^t
  \quad
  \text{and}
  \quad
  a_3+x_3=a_1^ux_1^v.
  \] In this paper, we classify all such graphs according to girth.

Combinatorics