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

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$\backslash$table$[[$Activity$,$immediate predecessors,expected time$],[$A$,-,10],[$B$,$A$,$D$,12],[$C$,$B$,9],[$D$,-,5],[$E$,$D$,$G$,7],[$F$,$E$,6],[$G$,-,3],[$H$,$G$,4],[$I$,$H$,6]]$