[ A B C ] - A B C D -> [ X Z Y ]
node.i { label: "S P A C Y"; }
[ A ] { label: "S P A C E"; } --> { label: "S P A C E"; } [ B ] { class: i; }
[ A B C ] - A B C D -> [ X Z Y ]
node.i { label: "S P A C Y"; }
[ A ] { label: "S P A C E"; } --> { label: "S P A C E"; } [ B ] { class: i; }