“…This module is not the only possible choice for generating the operator ∆ P , as the following example shows. Let us consider structures with growth vector (2,3,5), that is, the space n is spanned by e 1 , e 2 , e 3 , e 4 , e 5 and we have the following structure equations on g = n ⊕ h The differentials of degree one components are given, for e i ⊗ e j ∧ e k abbreviated to e jk i , by ∂ e 0 ⊗ e 1 = −e 21 1 + e 41 5 − e 51 4 , ∂ e 0 ⊗ e 2 = e 12 2 + e 42 5 − e 52 4 , ∂ e 1 ⊗ e 3 = −e 23 3 − e 12 1 , ∂ e 2 ⊗ e 3 = e 13 3 − e 12 2 , ∂ e 3 ⊗ e 4 = e 14 4 + e 24 5 − e 13 3 , ∂ e 3 ⊗ e 5 = e 15 4 + e 25 5 − e 23 3 .…”