$($please help me with this. I have to make a Gantt chart$)$

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$\backslash$table$[[$Activity$,$immediate predecessors,expected time$],[$A$,-,4],[$B$,-,6],[$C$,$B$,4],[$D$,$A$,12],[$E$,$A$,$C$,7],[$F$,$B$,9],[$G$,$E$,$F$,5]]$