“…First, if we forget about node 1 and the edge joining nodes 1 and 3 on the Dynkin diagram, we obtain a Dynkin diagram of type D 5 on nodes 2, 3, 4, 5, 6. For the vectors indexed by the positive roots issued from this diagram, we use the same notations as in [18] with node i + 1 now playing the role of node i. So, for instance w 2j , j ≥ 4 (resp w 23 ) denotes the vector associated with the positive root α 2 + α 4 + • • • + α j (resp with the simple root α 2 ); we denote by w 3j , j ≥ 4 the vector associated with the positive root α 2 + α 3 + α 4 + • • • + α j ; we denote by w st , s ≥ 4 the vector associated with the positive roots…”