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$,2,-,0,2,0,2,0],[$B$,9,$A$,2,11,2,11,0],[$C$,5,$A$,2,7,11,16,9],[$D$,7,$B$,11,18,11,18,0],[$E$,2,$B$,$ C$,11,13,,,],[$F$,6,$D$,$ E$,,,,,],[$G$,5,$E$,13,18,,,]]$

$5$

$1$

$6$

$3$