Fig 3. Reducing the k-node graphlet G_a to a k − 1 node graphlet G′.

O₅₉ appears in G_a = G₂₄; the node in O₅₉ is labelled x. Removal of node y results in G′ = G₇. The node in G′ that corresponds to x, x^G′, belongs to O₁₂. We assigned labels x₁, x₂ and x₃ to the remaining nodes of G′. Embeddings of G_a and G′ in H are referred to as $G_a^H$ and G′^H, respectively. The nodes corresponding to x and y are marked by x^H and y^H.