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

$\backslash$table$[[$Activity$,$Duration,Predecessor,ES$,$EF$,$LS$,$LF$,$SLACK$],[$A$,2,-,0,2,0,2,0],[$B$,10,$A$,2,12,2,12,0],[$C$,8,$A$,2,10,6,14,4],[$D$,7,$B$,12,19,12,19,0],[$E$,5,$B$,$ C$,12,17,,,],[$F$,5,$D$,$ E$,,,,,],[$G$,4,$E$,17,21,,,]]$