This image shows a portion of the Assign Servers to Clusters screen. There are two panes. The left pane (Servers) lists the AdminServer only. The right pane (Clusters) shows an open Cluster folder. Under it are 4 cluster elements: fmw_Machine_1, fmw_Machine_2, fmw_Machine_3, and fmw_Machine_4.
Nested under the fmw_Machine elements are server elements.
fmw_server_1 and fmw_server_2 are nested under fmw_Machine_1.
fmw_server_3 is nested under fmw_Machine_2.
fmw_server_4 is nested under fmw_Machine_3
fmw_server_5 and fmw_server_6 are nested under fmw_Machine_4