Hold option/alt: Drag to pan; Scroll mouse wheel to scale.
Double Click on node: Expand/Fold a node's subtree.
Shift+Click on background: Creat a node.
Shift+Double Click on node: Expand direct descendants only.
Shift+Drag between nodes: Creat a link.
The following line(s) in your statement(s) are not supported.
Please validate all the statement(s). Then try import again.
The labels of the seletced nodes and links are listed below: