Given the following partially completed Project Activity Description and Network Diagram, calculate the SLACK for ACTIVITY E$.$

$\backslash$table$[[$Activity$,$Duration,Predecessor,ES$,$EF$,$LS$,$LF$,$SLACK$],[$A$,3,-,0,3,0,3,0],[$B$,1,$A$,3,4,3,4,0],[$C$,2,$A$,3,5,4,6,1],[$D$,9,$B$,4,13,4,13,0],[$E$,6,$B$,$ C$,5,11,,,],[$F$,8,$D$,$ E$,,,,,],[$G$,9,$E$,11,20,,,]]$